81721420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{12809}}^1$

素因数の和:12858

約数の個数: 48

約数和(自身を含む): 193687200

約数和(自身を除く): 111965780

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 29, 44, 55, 58, 110, 116, 145, 220, 290, 319, 580, 638, 1276, 1595, 3190, 6380, 12809, 25618, 51236, 64045, 128090, 140899, 256180, 281798, 371461, 563596, 704495, 742922, 1408990, 1485844, 1857305, 2817980, 3714610, 4086071, 7429220, 8172142, 16344284, 20430355, 40860710, 81721420]

約数ペア:

[(1, 81721420), (2, 40860710), (4, 20430355), (5, 16344284), (10, 8172142), (11, 7429220), (20, 4086071), (22, 3714610), (29, 2817980), (44, 1857305), (55, 1485844), (58, 1408990), (110, 742922), (116, 704495), (145, 563596), (220, 371461), (290, 281798), (319, 256180), (580, 140899), (638, 128090), (1276, 64045), (1595, 51236), (3190, 25618), (6380, 12809)]