21009404

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31079}}^1$

素因数の和:31109

約数の個数: 18

約数和(自身を含む): 39813480

約数和(自身を除く): 18804076

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31079, 62158, 124316, 404027, 808054, 1616108, 5252351, 10504702, 21009404]

約数ペア:

[(1, 21009404), (2, 10504702), (4, 5252351), (13, 1616108), (26, 808054), (52, 404027), (169, 124316), (338, 62158), (676, 31079)]