I didn't make it up out of nothing.
http://aroundcny.com/technofile/texts/tec081097.html
True, but you're still wrong :) In 1997 Microsoft bought $150 million of non-voting Apple stock, which IIRC was about 5% of outstanding shares. They sold them a few years later for a rather large profit.
You claimed Bill Gates owned 20% of Apple.
Microsoft invested $150 million in Apple in 1997 when Apple shares were selling for ~$6 a share. That means that MS probably bought around 25 million shares. Assuming (and it is just that, an assumption) that MS has bought no more shares since then, those 25 million shares are a little over 6% of the 404.55million shares outstanding of Apple Common stock... if MS still owns them.