20718040

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{1213}}^1$

素因数の和:1292

約数の個数: 64

約数和(自身を含む): 54192960

約数和(自身を除く): 33474920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 61, 70, 122, 140, 244, 280, 305, 427, 488, 610, 854, 1213, 1220, 1708, 2135, 2426, 2440, 3416, 4270, 4852, 6065, 8491, 8540, 9704, 12130, 16982, 17080, 24260, 33964, 42455, 48520, 67928, 73993, 84910, 147986, 169820, 295972, 339640, 369965, 517951, 591944, 739930, 1035902, 1479860, 2071804, 2589755, 2959720, 4143608, 5179510, 10359020, 20718040]

約数ペア:

[(1, 20718040), (2, 10359020), (4, 5179510), (5, 4143608), (7, 2959720), (8, 2589755), (10, 2071804), (14, 1479860), (20, 1035902), (28, 739930), (35, 591944), (40, 517951), (56, 369965), (61, 339640), (70, 295972), (122, 169820), (140, 147986), (244, 84910), (280, 73993), (305, 67928), (427, 48520), (488, 42455), (610, 33964), (854, 24260), (1213, 17080), (1220, 16982), (1708, 12130), (2135, 9704), (2426, 8540), (2440, 8491), (3416, 6065), (4270, 4852)]