Prime-time viewership numbers compiled by the Nielsen Co. for Sept. 21-27. Listings include the week's ranking, with viewership for the week and season-to-date rankings in parentheses. An "X" in parentheses denotes a one-time-only presentation.

1. (2) "NCIS," CBS, 20.6 million viewers.

2. (3) "NCIS: Los Angeles," CBS, 18.73 million viewers.

3. (4) "Dancing With the Stars" (Monday), ABC, 17.79 million viewers.

4. (1) Sunday Night Football: Indianapolis at Arizona, NBC, 17.47 million viewers.

5. (5) "House," Fox, 17.16 million viewers.

6. (6) "Grey's Anatomy," ABC, 17.03 million viewers.

7. (8) "CSI: Crime Scene Investigation," CBS, 16.01 million viewers.

8. (9) "Criminal Minds," CBS, 15.84 million viewers.

9. (X) "Dancing With the Stars" (Tuesday), ABC, 15.367 million viewers.

10. (X) "Dancing With the Stars" (Wednesday), ABC, 15.356 million viewers.

11. (11) "The Mentalist," CBS, 15.07 million viewers.

12. (11) "CSI: New York," CBS, 15.06 million viewers.

13. (13) "60 Minutes," CBS, 14.88 million viewers.

14. (14) "CSI: Miami," CBS, 14.20 million viewers.

15. (15) "The Good Wife," CBS, 13.71 million viewers.

16. (15) "Desperate Housewives," ABC, 13.64 million viewers.

17. (15) "Two And a Half Men," CBS, 13.63 million viewers.

18. (7) "Sunday Night NFL Pre-Kick," NBC, 13.35 million viewers.

19. (19) "The Big Bang Theory," CBS, 12.96 million viewers.

20. (20) "Modern Family," ABC, 12.61 million viewers.

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ABC is owned by The Walt Disney Co. CBS is a division of CBS Corp. Fox is a unit of News Corp. NBC is owned by General Electric Co.