It's quite acceptable to call it a 20-agon but knowing its properties is more important which are:-
Interior angles add up to 3240 degrees
Exterior angles add up 360 degrees
It has 170 diagonals
It consists of 18 triangles
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name of 4000 sided polygon
The name of a 200 sided polygon is dihectagon.
The name of a 600 sided polygon is Hexcosiagon.
There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
it depends which polygon you are asking about. A square is a 4 sided polygon.