19807420

素因数分解:

$2^2\times 5^1\times {\mathrm{990371}}^1$

素因数の和:990380

約数の個数: 12

約数和(自身を含む): 41595624

約数和(自身を除く): 21788204

約数列:

[1, 2, 4, 5, 10, 20, 990371, 1980742, 3961484, 4951855, 9903710, 19807420]

約数ペア:

[(1, 19807420), (2, 9903710), (4, 4951855), (5, 3961484), (10, 1980742), (20, 990371)]