v=60-20
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It is a triangular prism that has 5 faces, 6 vertices and 9 edges
It has 6 vertices.
6
The only thing that can be said that there must be at least 4 faces and at least 6 edges and that the polyhedron must satisfy the Euler criterion which requires that: Faces + Vertices = Edges + 2.
If the object is a convex polyhedron, then, by Euler's characteristics, it should have 23 faces.