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:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 145.0 | 4.0 | " Fannysmackin' " | Richard J. Lewis | Dustin Lee Abraham | October12,2006 | 21.85 |
| 146.0 | 5.0 | "Double-Cross" | Michael Slovis | Marlene Meyer | October19,2006 | 20.49 |
| 147.0 | 6.0 | " Burn Out " | Alec Smight | Jacqueline Hoyt | November2,2006 | 20.77 |
| 149.0 | 8.0 | "Happenstance" | Jean de Segonzac | Sarah Goldfinger | November16,2006 | 24.11 |
| 151.0 | 10.0 | "Loco Motives" | Kenneth Fink | Evan Dunsky & Anthony E. Zuiker | December7,2006 | 23.25 |
| 153.0 | 12.0 | " Sweet Jane " | Kenneth Fink | Kenneth Fink & Naren Shankar | January18,2007 | 21.41 |
| 155.0 | 14.0 | "Meet Market" | Paris Barclay | Dustin Lee Abraham | February1,2007 | 21.49 |
| 157.0 | 16.0 | "Monster in the Box" | Jeffrey Hunt | Naren Shankar & Douglas Petrie | February15,2007 | 22.71 |
| 158.0 | 17.0 | "Fallen Idols" | Christopher Leitch | Marlene Meyer | February22,2007 | 21.78 |
| 159.0 | 18.0 | " Empty Eyes " | Michael Slovis | Allen MacDonald | March29,2007 | 22.71 |
| 160.0 | 19.0 | " Big Shots " | Jeff Woolnough | Dustin Lee Abraham | April5,2007 | 21.69 |
| 162.0 | 21.0 | " Ending Happy " | Kenneth Fink | Evan Dunsky | April26,2007 | 20.20 |
| 164.0 | 23.0 | "The Good, the Bad, and the Dominatrix" | Alec Smight | Jacqueline Hoyt | May10,2007 | 18.75 |
Question:
What is the number in the season that Marlene Meyer wrote and 20.49 million people watched?
Answer:
5.0