19 sides
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19
Its enneadecagon and 19
enneadecagon or enneakaidecagon
11 regular hendecagon 12 regular dodecagon 13 regular triskaidecagon 14 regular tetradecagon 15 regular pentadecagon 16 regular hexadecagon 17 regular heptadecagon 18 regular octadecagon 19 regular enneadecagon 20 regular icosagon
Enneadecagon, or also known as Enneakaidecagon.