What's the overlapping calendar of two different lunar cycles

In My world of PD there are two distinct moons, Aurie is a big cream colored moon on a 32 day cycle and Chi is a smaller rust- colored moon on a 20 day cycle. Can somebody help me figure out how often they would be full at the same time? I'm looking for maybe an equation to figure out how often they overlap and I don't know where to begin!

I'd like to figure out what the calendar would look like, how the moons would look when they weren't in sync, etc

Bonus points if you can tell me definitively or not, is it practical to keep calendars based on the moons if they're so different. There are no real axial seasons on this planet.

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What's the overlapping calendar of two different lunar cycles

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