Now That's What I Call Music! 20 (U.S. series)
 This article describes the 20th album in the U.S. Now! series. It should not be confused with identically-numbered albums from other Now! series. For more information see Now That's What I Call Music! 20 and Now That's What I Call Music! discographyNow That's What I Call Music! 20 was released on November 1 2005. The album is the 20th edition of the (U.S.) Now! series. It debuted at number-one on the Billboard 200 and is the eighth number-one album in the series.