That depends on the individual and where they feel comfortable re body composition. Some people won't gain a lot of bodyfat and others will not care how much they gain. It's not good for your body to go from one excess to another though, and the less bodyfat gained from your initial starting body composition, IMO, is the best way to be re bulking.
However, as a male, 20% bodyfat is getting too high. I'd say stay about average male body composition (~15% bodyfat) for bulking as a guideline, but again, that's really your decision.
~Rosie~