20
positive integer, abundant number, even number, dodecahedral number, pronic number, tetrahedral number, magic number, admirable number, composite number, harshad number| name in hiero markup | V20-V20  |
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| follows | 19  |
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| followed by | 21  |
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| prime factor | 2, 5  |
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| maintained by WikiProject | WikiProject Mathematics  |
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| mathematical inverse | −20  |
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| Unicode character | ⒇, ⓴, ⑳, ㉉, ⒛  |
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Amakumi abiri (20), n'Enamba ey'okubarisa.