81404240

素因数分解:

$2^4\times 5^1\times {\mathrm{1017553}}^1$

素因数の和:1017566

約数の個数: 20

約数和(自身を含む): 189265044

約数和(自身を除く): 107860804

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1017553, 2035106, 4070212, 5087765, 8140424, 10175530, 16280848, 20351060, 40702120, 81404240]

約数ペア:

[(1, 81404240), (2, 40702120), (4, 20351060), (5, 16280848), (8, 10175530), (10, 8140424), (16, 5087765), (20, 4070212), (40, 2035106), (80, 1017553)]