20781290

素因数分解:

$2^1\times 5^1\times {\mathrm{409}}^1\times {\mathrm{5081}}^1$

素因数の和:5497

約数の個数: 16

約数和(自身を含む): 37505160

約数和(自身を除く): 16723870

約数列:

[1, 2, 5, 10, 409, 818, 2045, 4090, 5081, 10162, 25405, 50810, 2078129, 4156258, 10390645, 20781290]

約数ペア:

[(1, 20781290), (2, 10390645), (5, 4156258), (10, 2078129), (409, 50810), (818, 25405), (2045, 10162), (4090, 5081)]