20965700

素因数分解:

$2^2\times 5^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{491}}^1$

素因数の和:573

約数の個数: 72

約数和(自身を含む): 52954944

約数和(自身を除く): 31989244

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 50, 61, 70, 100, 122, 140, 175, 244, 305, 350, 427, 491, 610, 700, 854, 982, 1220, 1525, 1708, 1964, 2135, 2455, 3050, 3437, 4270, 4910, 6100, 6874, 8540, 9820, 10675, 12275, 13748, 17185, 21350, 24550, 29951, 34370, 42700, 49100, 59902, 68740, 85925, 119804, 149755, 171850, 209657, 299510, 343700, 419314, 599020, 748775, 838628, 1048285, 1497550, 2096570, 2995100, 4193140, 5241425, 10482850, 20965700]

約数ペア:

[(1, 20965700), (2, 10482850), (4, 5241425), (5, 4193140), (7, 2995100), (10, 2096570), (14, 1497550), (20, 1048285), (25, 838628), (28, 748775), (35, 599020), (50, 419314), (61, 343700), (70, 299510), (100, 209657), (122, 171850), (140, 149755), (175, 119804), (244, 85925), (305, 68740), (350, 59902), (427, 49100), (491, 42700), (610, 34370), (700, 29951), (854, 24550), (982, 21350), (1220, 17185), (1525, 13748), (1708, 12275), (1964, 10675), (2135, 9820), (2455, 8540), (3050, 6874), (3437, 6100), (4270, 4910)]