Sony Computer Entertainment Inc. (SCEI) today announced that the cumulative number of registered accounts on PlayStation Network worldwide has exceeded 20 million as of February 20, 2009. The registered accounts on PlayStation Network reached 5million in 1 year and 2 months, 10 million in 1 year and 8 months, and exceeded 20 million in only 2 years and 3 months from the service launch on November 11, 2006. 

Sony said that the PS3 has sold 21.3 million units as of December 2008 and the PSP sold 50 million units as of January 2009. So that means that market saturation is approaching? 20 million accounts and 21.3 PS3 owners. They probably all own PSPs as well so that leaves 28.7 million PSP owners not signed up. Perhaps if they started marketing a lot of content for the PSP they’ll get more signups from that sector. Better yet, if they could make some small downloadable games that could be played on both the PS3 and PSP, then maybe they’d see some further expansion.