21420412

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31687}}^1$

素因数の和:31717

約数の個数: 18

約数和(自身を含む): 40592328

約数和(自身を除く): 19171916

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31687, 63374, 126748, 411931, 823862, 1647724, 5355103, 10710206, 21420412]

約数ペア:

[(1, 21420412), (2, 10710206), (4, 5355103), (13, 1647724), (26, 823862), (52, 411931), (169, 126748), (338, 63374), (676, 31687)]