21490790

素因数分解:

$2^1\times 5^1\times {\mathrm{139}}^1\times {\mathrm{15461}}^1$

素因数の和:15607

約数の個数: 16

約数和(自身を含む): 38964240

約数和(自身を除く): 17473450

約数列:

[1, 2, 5, 10, 139, 278, 695, 1390, 15461, 30922, 77305, 154610, 2149079, 4298158, 10745395, 21490790]

約数ペア:

[(1, 21490790), (2, 10745395), (5, 4298158), (10, 2149079), (139, 154610), (278, 77305), (695, 30922), (1390, 15461)]