@Candid Cow Hi, there are already lots of random number generator in the forum, better checking them before asking. Anyways,
!addcom -cd=5 !pickanumber $(eval number=Math.floor(Math.random() * 20) + 1; "@$(user) I pick " + number)
Usage
Ritik: !PickANumber
Nightbot: @Ritik I pick 10
Regards