A polygon with 20 sides is called an icosagon, while a polygon with 29 sides is called an enneakaikaienneagon. These names are derived from the Greek numerical prefixes "icosi-" and "enneakaikaiennea-", which mean twenty and twenty-nine, respectively. The suffix "-gon" is added to indicate a polygon.
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The name of a polygon with 20 sides is an icosagon, and a polygon with 29 sides is called an enneakaidecagon. So there you have it, two fancy names for some oddly shaped figures. Hope that clears things up for you!
I suggest you forget about memorizing fancy names - which really serve no useful purpose - and just call them "20-sided polygon", "21-sided polygon", etc.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
The name of a 11 sided polygon is Hendecagon.
N-gon is the name of 13-20 sided polygon.
An icosikaidigon is a 22-sided polygon. For names of polygons see http://mathforum.org/dr.math/faq/faq.polygon.names.html
The name of a 51 sided polygon is Pentaconhenagon. The name of a 52 sided polygon is Pentacondigon. The name of a 53 sided polygon is Pentacontrigon. The name of a 54 sided polygon is Pentacontetragon. The name of a 55 sided polygon is Pentaconpentagon. The name of a 56 sided polygon is Pentaconheptagon. The name of a 57 sided polygon is Pentaconhexagon. The name of a 58 sided polygon is Pentaconoctagon. The name of a 59 sided polygon is Pentaconenneagon.