There are actually more than a pyramid that have that number of edges. Pentagonal star pyramid has 20 edges. Decagonal pyramid is another one.
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10 I think? * * * * * Sorry, but you think wrong. There are 20.
20 edges, 11 vertices (corners) and 11 faces.
An octagonal pyramid has 9 faces and 14 edges. The base of the pyramid is an octagon with 8 faces, and the pyramid itself has an additional triangular face. The edges consist of the edges of the octagon base and the edges connecting the base to the apex of the pyramid.
there is 13 edges in a heptagonal pyramid.
a rectangular pyramid has a total of 8 edges