23 (24 with the -l), and doesn't print the trailing space!

$perl -le'$,=$";print"002".."020"'
002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 01
+9 020

$perl -e'print length q/$,=$";print"002".."020"/'
23
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Update: I guess I was beaten to the punch. sauoq's is an update, and it wasn't there when I began writing this post (I searched the page for $" before I started writing my post).