Here's a thread talking about 73 million sellers at GDC:
http://www.vgchartz.com/forum/thread.php?id=65435
So, Iwata at GDC in March says 73 million-sellers, fiscal '09 report says 54 million-sellers by the end of March, and VGC lists 51 games as million-sellers as of late April.
Either Iwata is a dirty, dirty liar, or financials are talking about sellthrough and not shipped.
Edit: Or is it possible that there are 19 downloadable games which have sold a million?

"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
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