guys i have Etherium private key was saved in notepad accidently my kids press some alphabet and first 20 digits missing
20 characters missing!!?! 
Your chances of being able to recover that in a 'timely' manner are pretty much zero... that's nearly 1/3 of the 64 hex characters making up a private key... and something ludicrous like 16^20 permutations... 1208925819614629174706176 to be precise.
