1 million allegedly mined by Satoshi
3 to 4 million lost over the years.
About 5 million not moving. I'm sure there's a site out there that can just look a coins that have not moved in over 7 or 8 years, and you have a good idea of coins that are lost, gone, forgotten, or otherwise inaccessible.
there has been some attempts but all of them are a failure before they even began because bitcoin is pseudonymous and you will never ever be able to look at the blockchain and claim coins are lost just because they have not moved.
for instance i have coins that i received in 2014 and have not moved them ever since (5 years) that doesn't make them lost, i still own the private keys. but in the eyes of many who just look at the blockchain it is categorized under "lost coins"!