20508880

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{691}}^1$

素因数の和:764

約数の個数: 80

約数和(自身を含む): 55603584

約数和(自身を除く): 35094704

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 53, 56, 70, 80, 106, 112, 140, 212, 265, 280, 371, 424, 530, 560, 691, 742, 848, 1060, 1382, 1484, 1855, 2120, 2764, 2968, 3455, 3710, 4240, 4837, 5528, 5936, 6910, 7420, 9674, 11056, 13820, 14840, 19348, 24185, 27640, 29680, 36623, 38696, 48370, 55280, 73246, 77392, 96740, 146492, 183115, 193480, 256361, 292984, 366230, 386960, 512722, 585968, 732460, 1025444, 1281805, 1464920, 2050888, 2563610, 2929840, 4101776, 5127220, 10254440, 20508880]

約数ペア:

[(1, 20508880), (2, 10254440), (4, 5127220), (5, 4101776), (7, 2929840), (8, 2563610), (10, 2050888), (14, 1464920), (16, 1281805), (20, 1025444), (28, 732460), (35, 585968), (40, 512722), (53, 386960), (56, 366230), (70, 292984), (80, 256361), (106, 193480), (112, 183115), (140, 146492), (212, 96740), (265, 77392), (280, 73246), (371, 55280), (424, 48370), (530, 38696), (560, 36623), (691, 29680), (742, 27640), (848, 24185), (1060, 19348), (1382, 14840), (1484, 13820), (1855, 11056), (2120, 9674), (2764, 7420), (2968, 6910), (3455, 5936), (3710, 5528), (4240, 4837)]