21287240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{47}}^1\times {\mathrm{67}}^1$

素因数の和:151

約数の個数: 96

約数和(自身を含む): 53758080

約数和(自身を除く): 32470840

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 47, 52, 65, 67, 94, 104, 130, 134, 169, 188, 235, 260, 268, 335, 338, 376, 470, 520, 536, 611, 670, 676, 845, 871, 940, 1222, 1340, 1352, 1690, 1742, 1880, 2444, 2680, 3055, 3149, 3380, 3484, 4355, 4888, 6110, 6298, 6760, 6968, 7943, 8710, 11323, 12220, 12596, 15745, 15886, 17420, 22646, 24440, 25192, 31490, 31772, 34840, 39715, 40937, 45292, 56615, 62980, 63544, 79430, 81874, 90584, 113230, 125960, 158860, 163748, 204685, 226460, 317720, 327496, 409370, 452920, 532181, 818740, 1064362, 1637480, 2128724, 2660905, 4257448, 5321810, 10643620, 21287240]

約数ペア:

[(1, 21287240), (2, 10643620), (4, 5321810), (5, 4257448), (8, 2660905), (10, 2128724), (13, 1637480), (20, 1064362), (26, 818740), (40, 532181), (47, 452920), (52, 409370), (65, 327496), (67, 317720), (94, 226460), (104, 204685), (130, 163748), (134, 158860), (169, 125960), (188, 113230), (235, 90584), (260, 81874), (268, 79430), (335, 63544), (338, 62980), (376, 56615), (470, 45292), (520, 40937), (536, 39715), (611, 34840), (670, 31772), (676, 31490), (845, 25192), (871, 24440), (940, 22646), (1222, 17420), (1340, 15886), (1352, 15745), (1690, 12596), (1742, 12220), (1880, 11323), (2444, 8710), (2680, 7943), (3055, 6968), (3149, 6760), (3380, 6298), (3484, 6110), (4355, 4888)]