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I know the maximum transaction size is 500Kb.

I also know there is a maximum for sigop in a transaction (20,000?).

What I'm interested in is what is the maximum number of txouts you could include in a single transaction.

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There is no practical maximum number of outputs in a transaction. The number of transactions can be up to 264-1, or 18446744073709551615. The transaction fee would be more than the total bitcoins to ever exist.

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    The maximum block size is 250,000 bytes (en.bitcoin.it/wiki/Transaction_fees). txin is approximately 148 bytes, a txout is about 34 bytes. Assuming 1 txin then max_txout ~= 7348. However, I believe that calculation is also limited by the max sigop limit. – user789235 Jan 28 '14 at 20:50
  • @GregHewgill how did you come up with 2^64-1? – George Kimionis Oct 29 '14 at 22:27
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    @GeorgeKimionis: The number of transactions is stored in the Bitcoin block as a Variable length integer, which has a maximum range of 2^64-1. – Greg Hewgill Oct 29 '14 at 22:30

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