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|Number of cells||21|
|Rotor type||Diagonal on-off|
|Year of discovery||Unknown|
20P2 is about the thirty-fourth most common naturally-occurring oscillator in Achim Flammenkamp's census, being slightly less common than the cis-beacon on cap and the 1 beacon but more common than the cis-beacon down on long hook. It is currently the most common unnamed oscillator.
- Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- 21P2.1593 at Heinrich Koenig's Game of Life Object Catalogs