An icosagon
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A 20-sided flat figure (polygon) is called an icosagon. If it is a solid figure--three-dimensional--it is an icosahedron.
Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?
A polygon with 20 sides is called either a 20-gon or an icosagon.
A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.
Icosahedron is a 20 sided polygon.