20868980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{3271}}^1$

素因数の和:3320

約数の個数: 48

約数和(自身を含む): 49472640

約数和(自身を除く): 28603660

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, 3271, 6380, 6542, 13084, 16355, 32710, 35981, 65420, 71962, 94859, 143924, 179905, 189718, 359810, 379436, 474295, 719620, 948590, 1043449, 1897180, 2086898, 4173796, 5217245, 10434490, 20868980]

約数ペア:

[(1, 20868980), (2, 10434490), (4, 5217245), (5, 4173796), (10, 2086898), (11, 1897180), (20, 1043449), (22, 948590), (29, 719620), (44, 474295), (55, 379436), (58, 359810), (110, 189718), (116, 179905), (145, 143924), (220, 94859), (290, 71962), (319, 65420), (580, 35981), (638, 32710), (1276, 16355), (1595, 13084), (3190, 6542), (3271, 6380)]