20688910

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^2\times {\mathrm{521}}^1$

素因数の和:577

約数の個数: 48

約数和(自身を含む): 42958512

約数和(自身を除く): 22269602

約数列:

[1, 2, 5, 10, 11, 19, 22, 38, 55, 95, 110, 190, 209, 361, 418, 521, 722, 1042, 1045, 1805, 2090, 2605, 3610, 3971, 5210, 5731, 7942, 9899, 11462, 19798, 19855, 28655, 39710, 49495, 57310, 98990, 108889, 188081, 217778, 376162, 544445, 940405, 1088890, 1880810, 2068891, 4137782, 10344455, 20688910]

約数ペア:

[(1, 20688910), (2, 10344455), (5, 4137782), (10, 2068891), (11, 1880810), (19, 1088890), (22, 940405), (38, 544445), (55, 376162), (95, 217778), (110, 188081), (190, 108889), (209, 98990), (361, 57310), (418, 49495), (521, 39710), (722, 28655), (1042, 19855), (1045, 19798), (1805, 11462), (2090, 9899), (2605, 7942), (3610, 5731), (3971, 5210)]