21386920

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{103}}^1\times {\mathrm{179}}^1$

素因数の和:322

約数の個数: 64

約数和(自身を含む): 50544000

約数和(自身を除く): 29157080

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 103, 116, 145, 179, 206, 232, 290, 358, 412, 515, 580, 716, 824, 895, 1030, 1160, 1432, 1790, 2060, 2987, 3580, 4120, 5191, 5974, 7160, 10382, 11948, 14935, 18437, 20764, 23896, 25955, 29870, 36874, 41528, 51910, 59740, 73748, 92185, 103820, 119480, 147496, 184370, 207640, 368740, 534673, 737480, 1069346, 2138692, 2673365, 4277384, 5346730, 10693460, 21386920]

約数ペア:

[(1, 21386920), (2, 10693460), (4, 5346730), (5, 4277384), (8, 2673365), (10, 2138692), (20, 1069346), (29, 737480), (40, 534673), (58, 368740), (103, 207640), (116, 184370), (145, 147496), (179, 119480), (206, 103820), (232, 92185), (290, 73748), (358, 59740), (412, 51910), (515, 41528), (580, 36874), (716, 29870), (824, 25955), (895, 23896), (1030, 20764), (1160, 18437), (1432, 14935), (1790, 11948), (2060, 10382), (2987, 7160), (3580, 5974), (4120, 5191)]