21061090

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67939}}^1$

素因数の和:67977

約数の個数: 16

約数和(自身を含む): 39133440

約数和(自身を除く): 18072350

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 67939, 135878, 339695, 679390, 2106109, 4212218, 10530545, 21061090]

約数ペア:

[(1, 21061090), (2, 10530545), (5, 4212218), (10, 2106109), (31, 679390), (62, 339695), (155, 135878), (310, 67939)]