9780020

素因数分解:

$2^2\times 5^1\times {\mathrm{489001}}^1$

素因数の和:489010

約数の個数: 12

約数和(自身を含む): 20538084

約数和(自身を除く): 10758064

約数列:

[1, 2, 4, 5, 10, 20, 489001, 978002, 1956004, 2445005, 4890010, 9780020]

約数ペア:

[(1, 9780020), (2, 4890010), (4, 2445005), (5, 1956004), (10, 978002), (20, 489001)]