21531640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{881}}^1$

素因数の和:952

約数の個数: 64

約数和(自身を含む): 53343360

約数和(自身を除く): 31811720

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 47, 52, 65, 94, 104, 130, 188, 235, 260, 376, 470, 520, 611, 881, 940, 1222, 1762, 1880, 2444, 3055, 3524, 4405, 4888, 6110, 7048, 8810, 11453, 12220, 17620, 22906, 24440, 35240, 41407, 45812, 57265, 82814, 91624, 114530, 165628, 207035, 229060, 331256, 414070, 458120, 538291, 828140, 1076582, 1656280, 2153164, 2691455, 4306328, 5382910, 10765820, 21531640]

約数ペア:

[(1, 21531640), (2, 10765820), (4, 5382910), (5, 4306328), (8, 2691455), (10, 2153164), (13, 1656280), (20, 1076582), (26, 828140), (40, 538291), (47, 458120), (52, 414070), (65, 331256), (94, 229060), (104, 207035), (130, 165628), (188, 114530), (235, 91624), (260, 82814), (376, 57265), (470, 45812), (520, 41407), (611, 35240), (881, 24440), (940, 22906), (1222, 17620), (1762, 12220), (1880, 11453), (2444, 8810), (3055, 7048), (3524, 6110), (4405, 4888)]