81619540

素因数分解:

$2^2\times 5^1\times {\mathrm{401}}^1\times {\mathrm{10177}}^1$

素因数の和:10587

約数の個数: 24

約数和(自身を含む): 171845352

約数和(自身を除く): 90225812

約数列:

[1, 2, 4, 5, 10, 20, 401, 802, 1604, 2005, 4010, 8020, 10177, 20354, 40708, 50885, 101770, 203540, 4080977, 8161954, 16323908, 20404885, 40809770, 81619540]

約数ペア:

[(1, 81619540), (2, 40809770), (4, 20404885), (5, 16323908), (10, 8161954), (20, 4080977), (401, 203540), (802, 101770), (1604, 50885), (2005, 40708), (4010, 20354), (8020, 10177)]