20498920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{499}}^1$

素因数の和:602

約数の個数: 64

約数和(自身を含む): 50400000

約数和(自身を除く): 29901080

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 79, 104, 130, 158, 260, 316, 395, 499, 520, 632, 790, 998, 1027, 1580, 1996, 2054, 2495, 3160, 3992, 4108, 4990, 5135, 6487, 8216, 9980, 10270, 12974, 19960, 20540, 25948, 32435, 39421, 41080, 51896, 64870, 78842, 129740, 157684, 197105, 259480, 315368, 394210, 512473, 788420, 1024946, 1576840, 2049892, 2562365, 4099784, 5124730, 10249460, 20498920]

約数ペア:

[(1, 20498920), (2, 10249460), (4, 5124730), (5, 4099784), (8, 2562365), (10, 2049892), (13, 1576840), (20, 1024946), (26, 788420), (40, 512473), (52, 394210), (65, 315368), (79, 259480), (104, 197105), (130, 157684), (158, 129740), (260, 78842), (316, 64870), (395, 51896), (499, 41080), (520, 39421), (632, 32435), (790, 25948), (998, 20540), (1027, 19960), (1580, 12974), (1996, 10270), (2054, 9980), (2495, 8216), (3160, 6487), (3992, 5135), (4108, 4990)]