Pedantry means going one step further than necessary, so let me end with this:
It won't even reach 20M because of Satoshi and others who lost their keys.
„Effectively“
Discussion
More fun facts, even if Satoshi comes back with his keys, he will never be able to spend the 50 BTC from the genesis block as the public key was manually created to bootstrap the process and therefore has no corresponding private key!
