20840120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{263}}^1\times {\mathrm{283}}^1$

素因数の和:564

約数の個数: 64

約数和(自身を含む): 53982720

約数和(自身を除く): 33142600

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 263, 280, 283, 526, 566, 1052, 1132, 1315, 1415, 1841, 1981, 2104, 2264, 2630, 2830, 3682, 3962, 5260, 5660, 7364, 7924, 9205, 9905, 10520, 11320, 14728, 15848, 18410, 19810, 36820, 39620, 73640, 74429, 79240, 148858, 297716, 372145, 521003, 595432, 744290, 1042006, 1488580, 2084012, 2605015, 2977160, 4168024, 5210030, 10420060, 20840120]

約数ペア:

[(1, 20840120), (2, 10420060), (4, 5210030), (5, 4168024), (7, 2977160), (8, 2605015), (10, 2084012), (14, 1488580), (20, 1042006), (28, 744290), (35, 595432), (40, 521003), (56, 372145), (70, 297716), (140, 148858), (263, 79240), (280, 74429), (283, 73640), (526, 39620), (566, 36820), (1052, 19810), (1132, 18410), (1315, 15848), (1415, 14728), (1841, 11320), (1981, 10520), (2104, 9905), (2264, 9205), (2630, 7924), (2830, 7364), (3682, 5660), (3962, 5260)]