There are going to be over 500 names on this ballot.I think that's highly unlikely. There have been that many who began the initial paperwork, but still have to pay the fee and get the signatures in by tomorrow morning. Relatively few have completed the process.
According to the Secretary of State of CA, 443 candidates have started the process, and 17 have already completed the paperwork.
Of the 17, there are 8 Democrats and 5 Republicans already on the ballot.
Info according to this weblink:
http://www.ss.ca.gov/elections/recall_cand.htm