21235240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{421}}^1$

素因数の和:542

約数の個数: 64

約数和(自身を含む): 52108560

約数和(自身を除く): 30873320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 97, 104, 130, 194, 260, 388, 421, 485, 520, 776, 842, 970, 1261, 1684, 1940, 2105, 2522, 3368, 3880, 4210, 5044, 5473, 6305, 8420, 10088, 10946, 12610, 16840, 21892, 25220, 27365, 40837, 43784, 50440, 54730, 81674, 109460, 163348, 204185, 218920, 326696, 408370, 530881, 816740, 1061762, 1633480, 2123524, 2654405, 4247048, 5308810, 10617620, 21235240]

約数ペア:

[(1, 21235240), (2, 10617620), (4, 5308810), (5, 4247048), (8, 2654405), (10, 2123524), (13, 1633480), (20, 1061762), (26, 816740), (40, 530881), (52, 408370), (65, 326696), (97, 218920), (104, 204185), (130, 163348), (194, 109460), (260, 81674), (388, 54730), (421, 50440), (485, 43784), (520, 40837), (776, 27365), (842, 25220), (970, 21892), (1261, 16840), (1684, 12610), (1940, 10946), (2105, 10088), (2522, 8420), (3368, 6305), (3880, 5473), (4210, 5044)]