If you wish to communicate information, I suggest you call a 200,000-sided polygon a 200,000-gon. Although there is a prefix for 200,000 I suggest you keep it simple. Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary.
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The 22 sided shape is called a: ICOSIKAIDIGON
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A 10-sided shape is called a decagon.
It is called a megagon. A ∞ sided shape is called an apeirogon.