80018020

素因数分解:

$2^2\times 5^1\times {\mathrm{4000901}}^1$

素因数の和:4000910

約数の個数: 12

約数和(自身を含む): 168037884

約数和(自身を除く): 88019864

約数列:

[1, 2, 4, 5, 10, 20, 4000901, 8001802, 16003604, 20004505, 40009010, 80018020]

約数ペア:

[(1, 80018020), (2, 40009010), (4, 20004505), (5, 16003604), (10, 8001802), (20, 4000901)]