20991686

素因数分解:

$2^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{7481}}^1$

素因数の和:7567

約数の個数: 16

約数和(自身を含む): 33399648

約数和(自身を除く): 12407962

約数列:

[1, 2, 23, 46, 61, 122, 1403, 2806, 7481, 14962, 172063, 344126, 456341, 912682, 10495843, 20991686]

約数ペア:

[(1, 20991686), (2, 10495843), (23, 912682), (46, 456341), (61, 344126), (122, 172063), (1403, 14962), (2806, 7481)]