20991341

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{241}}^1\times {\mathrm{541}}^1$

素因数の和:812

約数の個数: 16

約数和(自身を含む): 25183488

約数和(自身を除く): 4192147

約数列:

[1, 7, 23, 161, 241, 541, 1687, 3787, 5543, 12443, 38801, 87101, 130381, 912667, 2998763, 20991341]

約数ペア:

[(1, 20991341), (7, 2998763), (23, 912667), (161, 130381), (241, 87101), (541, 38801), (1687, 12443), (3787, 5543)]