21578960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20749}}^1$

素因数の和:20775

約数の個数: 40

約数和(自身を含む): 54033000

約数和(自身を除く): 32454040

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20749, 41498, 82996, 103745, 165992, 207490, 269737, 331984, 414980, 539474, 829960, 1078948, 1348685, 1659920, 2157896, 2697370, 4315792, 5394740, 10789480, 21578960]

約数ペア:

[(1, 21578960), (2, 10789480), (4, 5394740), (5, 4315792), (8, 2697370), (10, 2157896), (13, 1659920), (16, 1348685), (20, 1078948), (26, 829960), (40, 539474), (52, 414980), (65, 331984), (80, 269737), (104, 207490), (130, 165992), (208, 103745), (260, 82996), (520, 41498), (1040, 20749)]