20721421

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{173}}^1\times {\mathrm{241}}^1$

素因数の和:492

約数の個数: 16

約数和(自身を含む): 24254208

約数和(自身を除く): 3532787

約数列:

[1, 7, 71, 173, 241, 497, 1211, 1687, 12283, 17111, 41693, 85981, 119777, 291851, 2960203, 20721421]

約数ペア:

[(1, 20721421), (7, 2960203), (71, 291851), (173, 119777), (241, 85981), (497, 41693), (1211, 17111), (1687, 12283)]