The icosahedron is the shape that has 20 sides. The icosahedron also has five triangular faces that join together at each vertex.
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There is no limit to the number of sides that a particular shape can have. The Icosahedron has 20 sides. It would tend to the circle as the number tends to infinity: even a 360-sided polygon (1 degree internal angles) would look a bit like like a pixellated circle.
A decagon has 10 sides and so 2*10 = 20
It is an 8 sided octagon
a shape with ten sides
Well, honey, a shape with 20 sides is called an icosagon. It's like a polygon on steroids, with all those sides flaunting their angles like they're on a runway. So next time you need to impress someone with your geometry knowledge, just drop the word "icosagon" and watch them swoon.