It looks like the cheat codes for 2020 are the same as 2010, additionally there seems to be a 'cheat finalexam' which is supposed to skip to the next year.
Oh, and 'cheat noaiinit' which i don't know what it does yet, but probably stops the ai from initiliaising or something.
[Edited by quuux, 6/21/2008 8:42:14 PM]
I found some in the demo as well. But i don't know how you activate them. I notice they had zeros next to them so i imagine these would have to be changed to 1.