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| CALCULATION OF REGISTRATION FEE                                                                   |
| Title of Each Class of Securities Offered                                                         | Maximum Aggregate Offering Price (1) | Amount of Registration Fee(2) |
| MEDIUM-TERM NOTES, SERIES G, FLOATING RATE NOTES DUE 2014                                         | $100,000,000 | $13,640 |
| (1) Excludes accrued interest, if any.                                                            |   |   |
| (2) The filing fee is calculated in accordance with Rule 457(r) under the Securities Act of 1933. |

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| PRICING SUPPLEMENT NO. 20                                 |   | Filed Pursuant to Rule 424(b)(3) |
| Dated December 3, 2012 to                                 |   | Registration No. 333-173364 |
| PROSPECTUS SUPPLEMENT                                     |   |   |
| Dated April 7, 2011 and                                   |   |   |
| PROSPECTUS                                                |   |   |
| Dated April 7, 2011                                       |   |   |
| CATERPILLAR FINANCIAL SERVICES CORPORATION                |
| MEDIUM-TERM NOTES, SERIES G, FLOATING RATE NOTES DUE 2014 |

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|                                                                                                 |  |  |
| SUBJECT                                                                                         |   | FINAL PRICING DETAILS |
| Issuer:                                                                                         |   | Caterpillar Financial Services Corporation |
| Title of Securities:                                                                            |   | Medium-Term Notes, Series G, Floating Rate Notes Due 2014 |
| Form of Security:                                                                               |   | Global Note |
| Format:                                                                                         |   | SEC Registered-Registration Statement Number 333-173364 |
| Trade Date/Pricing Effective Time:                                                              |   | December 3, 2012 |
| Settlement Date (Original Issue Date):                                                          |   | December 4, 2012, which is the first business day following the Trade Date. |
| Maturity Date:                                                                                  |   | November 19, 2014 |
| Principal Amount:                                                                               |   | $100,000,000, to be added to the original $150,000,000 principal amount of the same tranche of Notes settling on the Settlement Date. |
| Price to Public (Issue Price):                                                                  |   | 100.00% |
| Dealer’s Commission:                                                                      |   | 0.10% (10 basis points) |
| All-in-price:                                                                                   |   | 99.90% |
| Net Proceeds to Issuer:                                                                         |   | $99,900,000 |
| Interest Rate Basis (Benchmark):                                                                |   | 3 Month USD LIBOR |
| Index Currency:                                                                                 |   | U.S. Dollars |
| Spread (Plus or Minus):                                                                         |   | + 10 basis points (0.10%) |
| Spread Multiplier:                                                                              |   | N/A |
| Spread/Spread Multiplier Reset Option:                                                          |   | N/A |
| Optional Reset Dates (only applicable if option to reset spread or spread multiplier):          | N/A |
| Basis for Interest Rate Reset (only applicable if option to reset spread or spread multiplier): | N/A |
| Specified Currency:                                                                             |   | U.S. Dollars |

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|                                                                                                                                                                                                                                                                                                                                                                                           |  |  |
| Option to Elect Payment in U.S. Dollars  (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                    | N/A |
| Authorized Denominations (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                              | N/A |
| Historical Exchange Rate (only applicable if Specified Currency is other than U.S. Dollars):                                                                                                                                                                                                                                                                                              | N/A |
| Maximum Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | N/A |
| Minimum Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | N/A |
| Initial Interest Rate:                                                                                                                                                                                                                                                                                                                                                                    |   | 3 Month USD LIBOR as of two (2) London Business Days prior to the Original Issue Date plus the Spread |
| Interest Reset Periods and Dates:                                                                                                                                                                                                                                                                                                                                                         |   | Quarterly on the 19th of  February, May, August and November of each year prior to the Maturity Date |
| Interest Determination Dates:                                                                                                                                                                                                                                                                                                                                                             |   | Quarterly, two (2) London Business Days prior to each Interest Reset Date |
| Interest Payment Dates:                                                                                                                                                                                                                                                                                                                                                                   |   | Interest will be paid quarterly on the 19th of February, May, August and November of each year, commencing February 19, 2013 and ending on the Maturity Date |
| Stated Maturity Extension Option:                                                                                                                                                                                                                                                                                                                                                         |   | N/A |
| Extension Period(s) and Final Maturity Date (only applicable if option to extend stated maturity):                                                                                                                                                                                                                                                                                        | N/A |
| Basis for Interest Rate During Extension Period (only applicable if option to extend stated maturity):                                                                                                                                                                                                                                                                                    | N/A |
| Original Issue Discount Note:                                                                                                                                                                                                                                                                                                                                                             |   | N/A |
| Total Amount of OID:                                                                                                                                                                                                                                                                                                                                                                      |   | N/A |
| Terms of Amortizing Notes:                                                                                                                                                                                                                                                                                                                                                                |   | N/A |
| Redemption Date(s):                                                                                                                                                                                                                                                                                                                                                                       |   | N/A |
| Redemption Price:                                                                                                                                                                                                                                                                                                                                                                         |   | N/A |
| Repayment Date(s):                                                                                                                                                                                                                                                                                                                                                                        |   | N/A |
| Repayment Price(s):                                                                                                                                                                                                                                                                                                                                                                       |   | N/A |
| Day Count Convention:                                                                                                                                                                                                                                                                                                                                                                     |   | Actual/360 |
| Denominations:                                                                                                                                                                                                                                                                                                                                                                            |   | Minimum denominations of $1,000 with increments of $1,000 thereafter |
| Sole Manager & Bookrunner:                                                                                                                                                                                                                                                                                                                                                            |   | RBS Securities Inc. (100.0%) |
| Billing and Delivery Agent:                                                                                                                                                                                                                                                                                                                                                               |   | RBS Securities Inc. |
| Exchange Rate Agent:                                                                                                                                                                                                                                                                                                                                                                      |   | U.S. Bank Trust National Association |
| Calculation Agent:                                                                                                                                                                                                                                                                                                                                                                        |   | U.S. Bank Trust National Association |
| CUSIP:                                                                                                                                                                                                                                                                                                                                                                                    |   | 14912L5K3 |
| Other Terms:                                                                                                                                                                                                                                                                                                                                                                              |   | N/A |
| CAPITALIZED TERMS USED HEREIN WHICH ARE DEFINED IN THE PROSPECTUS SUPPLEMENT SHALL HAVE THE MEANINGS ASCRIBED THERETO IN THE PROSPECTUS SUPPLEMENT. THE INTEREST RATES ON THE NOTES MAY BE CHANGED BY CATERPILLAR FINANCIAL SERVICES CORPORATION FROM TIME TO TIME, BUT ANY SUCH CHANGE WILL NOT AFFECT THE INTEREST RATE ON ANY NOTES OFFERED PRIOR TO THE EFFECTIVE DATE OF THE CHANGE. |