Bitcoin addresses ranges from 24-28 characters and so is litecoin. Monero is 90+ characters. Which crypto currency address format is the shortest that is in the top 50 of coinmarketcap?
It does not seem to be a good idea to only differentiate between the "number of characters". Some addresses are alphanumeric (Bitcoin), others are only hexadecimal (Ethereum), others are only numeric (LISK)...
What I found out:
NXT has 24 characters (example:
NXT-MT4P-AHG4-A4NA-CCMM2), only 20 without the static hyphens, only 17 without the static "NXT" in the beginning.
Lisk has 21 characters (example:
16118128613908223361L), only 20 without the static 'L' in the end.