21390837

素因数分解:

$3^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{1361}}^1$

素因数の和:1421

約数の個数: 24

約数和(自身を含む): 31903488

約数和(自身を除く): 10512651

約数列:

[1, 3, 13, 31, 39, 93, 169, 403, 507, 1209, 1361, 4083, 5239, 15717, 17693, 42191, 53079, 126573, 230009, 548483, 690027, 1645449, 7130279, 21390837]

約数ペア:

[(1, 21390837), (3, 7130279), (13, 1645449), (31, 690027), (39, 548483), (93, 230009), (169, 126573), (403, 53079), (507, 42191), (1209, 17693), (1361, 15717), (4083, 5239)]