There is no such figure as a 20 degrees polygon.
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There is no such polygon but if you meant exterior angles of 20 degrees then it will have 360/20 = 18 sides
20 sides
Its exterior angle is 20 degrees and it will have 360/20 = 18 sides
The sum of the exterior angles of any polygon is 360 degrees. If each angle is 20 degrees, there must be 360/20 = 18 such angles. 18 angles means 18 sides so it is an 18-sided polygon.
If those are exterior angles, the exterior angles of any polygon add up to 360. That would be 20 sides.