21211421

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{79}}^1\times {\mathrm{317}}^1$

素因数の和:425

約数の個数: 24

約数和(自身を含む): 27068160

約数和(自身を除く): 5856739

約数列:

[1, 7, 11, 77, 79, 121, 317, 553, 847, 869, 2219, 3487, 6083, 9559, 24409, 25043, 38357, 66913, 175301, 268499, 275473, 1928311, 3030203, 21211421]

約数ペア:

[(1, 21211421), (7, 3030203), (11, 1928311), (77, 275473), (79, 268499), (121, 175301), (317, 66913), (553, 38357), (847, 25043), (869, 24409), (2219, 9559), (3487, 6083)]