20 faces and 10 sides
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20 edges, 11 vertices (corners) and 11 faces.
Decahedron. * * * * * Or a hendecagonal pyramid or a decagonal prism or a cuboid with six corners chopped off or many other possibilities.
By "corners", do you mean vertices or edges?
10 I think? * * * * * Sorry, but you think wrong. There are 20.
Twenty edges