21784820

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^2\times {\mathrm{3769}}^1$

素因数の和:3812

約数の個数: 36

約数和(自身を含む): 48610380

約数和(自身を除く): 26825560

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 289, 340, 578, 1156, 1445, 2890, 3769, 5780, 7538, 15076, 18845, 37690, 64073, 75380, 128146, 256292, 320365, 640730, 1089241, 1281460, 2178482, 4356964, 5446205, 10892410, 21784820]

約数ペア:

[(1, 21784820), (2, 10892410), (4, 5446205), (5, 4356964), (10, 2178482), (17, 1281460), (20, 1089241), (34, 640730), (68, 320365), (85, 256292), (170, 128146), (289, 75380), (340, 64073), (578, 37690), (1156, 18845), (1445, 15076), (2890, 7538), (3769, 5780)]