A Hecatommyriagon has one million sides. Also megagon. See Sources and related links for more.
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a shape with one million sides
There is no "most" with respect to polygons. You could make a shape with a million sides, and then make a new shape with a million and one, and keep going forever.
A shape very close to a circle or an oval.
actually circles have one side... no shape exists, that has no sides
A shape with no sides next to each other would be a one sided shape, ie, a circle.