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<819
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The Number 820

Prime Factors of 820=2x2x5x41.

820 is a Triangular Number.

820 is a 20-gonal Number.

820 is a 31-gonal Number.

820 is a 138-gonal Number.

820 is a Centered Nonagonal Number.

820 is a Centered 39-gonal Number.


The Year 820 AD

In the year 820 AD...



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