20981940

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{49957}}^1$

素因数の和:49976

約数の個数: 48

約数和(自身を含む): 67143552

約数和(自身を除く): 46161612

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 49957, 99914, 149871, 199828, 249785, 299742, 349699, 499570, 599484, 699398, 749355, 999140, 1049097, 1398796, 1498710, 1748495, 2098194, 2997420, 3496990, 4196388, 5245485, 6993980, 10490970, 20981940]

約数ペア:

[(1, 20981940), (2, 10490970), (3, 6993980), (4, 5245485), (5, 4196388), (6, 3496990), (7, 2997420), (10, 2098194), (12, 1748495), (14, 1498710), (15, 1398796), (20, 1049097), (21, 999140), (28, 749355), (30, 699398), (35, 599484), (42, 499570), (60, 349699), (70, 299742), (84, 249785), (105, 199828), (140, 149871), (210, 99914), (420, 49957)]