12789020180

素因数分解:

$2^2\times 5^1\times {\mathrm{639451009}}^1$

素因数の和:639451018

約数の個数: 12

約数和(自身を含む): 26856942420

約数和(自身を除く): 14067922240

約数列:

[1, 2, 4, 5, 10, 20, 639451009, 1278902018, 2557804036, 3197255045, 6394510090, 12789020180]

約数ペア:

[(1, 12789020180), (2, 6394510090), (4, 3197255045), (5, 2557804036), (10, 1278902018), (20, 639451009)]