An Octadecagon
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There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
It has 360/20 = 18 sides
the name of the polygon with 101 sides is hecatontakaihenagon
A polygon with 4 sides is a quadrilateral.