638510020

素因数分解:

$2^2\times 5^1\times {\mathrm{31925501}}^1$

素因数の和:31925510

約数の個数: 12

約数和(自身を含む): 1340871084

約数和(自身を除く): 702361064

約数列:

[1, 2, 4, 5, 10, 20, 31925501, 63851002, 127702004, 159627505, 319255010, 638510020]

約数ペア:

[(1, 638510020), (2, 319255010), (4, 159627505), (5, 127702004), (10, 63851002), (20, 31925501)]