21805420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11981}}^1$

素因数の和:12010

約数の個数: 48

約数和(自身を含む): 56363328

約数和(自身を除く): 34557908

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 11981, 23962, 47924, 59905, 83867, 119810, 155753, 167734, 239620, 311506, 335468, 419335, 623012, 778765, 838670, 1090271, 1557530, 1677340, 2180542, 3115060, 4361084, 5451355, 10902710, 21805420]

約数ペア:

[(1, 21805420), (2, 10902710), (4, 5451355), (5, 4361084), (7, 3115060), (10, 2180542), (13, 1677340), (14, 1557530), (20, 1090271), (26, 838670), (28, 778765), (35, 623012), (52, 419335), (65, 335468), (70, 311506), (91, 239620), (130, 167734), (140, 155753), (182, 119810), (260, 83867), (364, 59905), (455, 47924), (910, 23962), (1820, 11981)]