21399620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{211}}^1\times {\mathrm{461}}^1$

素因数の和:692

約数の個数: 48

約数和(自身を含む): 49363776

約数和(自身を除く): 27964156

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 211, 220, 422, 461, 844, 922, 1055, 1844, 2110, 2305, 2321, 4220, 4610, 4642, 5071, 9220, 9284, 10142, 11605, 20284, 23210, 25355, 46420, 50710, 97271, 101420, 194542, 389084, 486355, 972710, 1069981, 1945420, 2139962, 4279924, 5349905, 10699810, 21399620]

約数ペア:

[(1, 21399620), (2, 10699810), (4, 5349905), (5, 4279924), (10, 2139962), (11, 1945420), (20, 1069981), (22, 972710), (44, 486355), (55, 389084), (110, 194542), (211, 101420), (220, 97271), (422, 50710), (461, 46420), (844, 25355), (922, 23210), (1055, 20284), (1844, 11605), (2110, 10142), (2305, 9284), (2321, 9220), (4220, 5071), (4610, 4642)]