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Is it possible to make a cron job run say, every 20 minutes, but make it not run for say, 1-4 in the morning.

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Yes it is.

0,20,40 0,5-23 * * * /job/to/run

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Might want 0,4-23 there depending on whether you want it to not happen until the end of 4 or at the beginning. – Ignacio Vazquez-Abrams Apr 9 '10 at 21:05
Might want to add 'refer to the man page`: ss64.com/bash/crontab.html – DaveParillo Apr 9 '10 at 21:53
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Don't forget that if you need more specific or complicated rules that can't be covered by the version of cron you're using, you can always write a small shellscript wrapper which will check the date +%H or other relevant statuses.

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