81538180

素因数分解:

$2^2\times 5^1\times {\mathrm{1871}}^1\times {\mathrm{2179}}^1$

素因数の和:4059

約数の個数: 24

約数和(自身を含む): 171400320

約数和(自身を除く): 89862140

約数列:

[1, 2, 4, 5, 10, 20, 1871, 2179, 3742, 4358, 7484, 8716, 9355, 10895, 18710, 21790, 37420, 43580, 4076909, 8153818, 16307636, 20384545, 40769090, 81538180]

約数ペア:

[(1, 81538180), (2, 40769090), (4, 20384545), (5, 16307636), (10, 8153818), (20, 4076909), (1871, 43580), (2179, 37420), (3742, 21790), (4358, 18710), (7484, 10895), (8716, 9355)]