79998020

素因数分解:

$2^2\times 5^1\times {\mathrm{3999901}}^1$

素因数の和:3999910

約数の個数: 12

約数和(自身を含む): 167995884

約数和(自身を除く): 87997864

約数列:

[1, 2, 4, 5, 10, 20, 3999901, 7999802, 15999604, 19999505, 39999010, 79998020]

約数ペア:

[(1, 79998020), (2, 39999010), (4, 19999505), (5, 15999604), (10, 7999802), (20, 3999901)]