Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Attendance |
| --- | --- | --- | --- | --- |
| 1.0 | September 7, 1980 | at Buffalo Bills | L 17–7 | 79598.0 |
| 2.0 | September 14, 1980 | Cincinnati Bengals | W 17–16 | 38322.0 |
| 3.0 | September 21, 1980 | at Atlanta Falcons | W 20–17 | 55470.0 |
| 4.0 | September 28, 1980 | New Orleans Saints | W 21–16 | 40946.0 |
| 5.0 | October 5, 1980 | Baltimore Colts | L 30–17 | 50631.0 |
| 6.0 | October 12, 1980 | at New England Patriots | L 34–0 | 60377.0 |
| 7.0 | October 19, 1980 | Buffalo Bills | W 17–14 | 41636.0 |
| 8.0 | October 27, 1980 | at New York Jets | L 17–14 | 53046.0 |
| 9.0 | November 2, 1980 | at Oakland Raiders | L 16–10 | 46378.0 |
| 10.0 | November 9, 1980 | at Los Angeles Rams | W 35–14 | 62198.0 |
| 11.0 | November 16, 1980 | San Francisco 49ers | W 17–13 | 45135.0 |
| 12.0 | November 20, 1980 | San Diego Chargers | L 27–24 | 63013.0 |
| 13.0 | November 30, 1980 | at Pittsburgh Steelers | L 23–10 | 51384.0 |
| 14.0 | December 8, 1980 | New England Patriots | W 16–13 | 63292.0 |
| 15.0 | December 14, 1980 | at Baltimore Colts | W 24–14 | 30564.0 |
| 16.0 | December 20, 1980 | New York Jets | L 24–17 | 41854.0 |
Question:
How many people attended the September 21, 1980 game?
Answer:
55470.0