21317540

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25997}}^1$

素因数の和:26047

約数の個数: 24

約数和(自身を含む): 45860472

約数和(自身を除く): 24542932

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25997, 51994, 103988, 129985, 259970, 519940, 1065877, 2131754, 4263508, 5329385, 10658770, 21317540]

約数ペア:

[(1, 21317540), (2, 10658770), (4, 5329385), (5, 4263508), (10, 2131754), (20, 1065877), (41, 519940), (82, 259970), (164, 129985), (205, 103988), (410, 51994), (820, 25997)]