21415420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2657}}^1$

素因数の和:2710

約数の個数: 48

約数和(自身を含む): 50012928

約数和(自身を除く): 28597508

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2657, 4030, 5314, 8060, 10628, 13285, 26570, 34541, 53140, 69082, 82367, 138164, 164734, 172705, 329468, 345410, 411835, 690820, 823670, 1070771, 1647340, 2141542, 4283084, 5353855, 10707710, 21415420]

約数ペア:

[(1, 21415420), (2, 10707710), (4, 5353855), (5, 4283084), (10, 2141542), (13, 1647340), (20, 1070771), (26, 823670), (31, 690820), (52, 411835), (62, 345410), (65, 329468), (124, 172705), (130, 164734), (155, 138164), (260, 82367), (310, 69082), (403, 53140), (620, 34541), (806, 26570), (1612, 13285), (2015, 10628), (2657, 8060), (4030, 5314)]