21216377

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^2\times {\mathrm{83}}^1$

素因数の和:209

約数の個数: 24

約数和(自身を含む): 26935104

約数和(自身を除く): 5718727

約数列:

[1, 7, 13, 53, 83, 91, 371, 581, 689, 1079, 2809, 4399, 4823, 7553, 19663, 30793, 36517, 57187, 233147, 255619, 400309, 1632029, 3030911, 21216377]

約数ペア:

[(1, 21216377), (7, 3030911), (13, 1632029), (53, 400309), (83, 255619), (91, 233147), (371, 57187), (581, 36517), (689, 30793), (1079, 19663), (2809, 7553), (4399, 4823)]