9990980

素因数分解:

$2^2\times 5^1\times {\mathrm{499549}}^1$

素因数の和:499558

約数の個数: 12

約数和(自身を含む): 20981100

約数和(自身を除く): 10990120

約数列:

[1, 2, 4, 5, 10, 20, 499549, 999098, 1998196, 2497745, 4995490, 9990980]

約数ペア:

[(1, 9990980), (2, 4995490), (4, 2497745), (5, 1998196), (10, 999098), (20, 499549)]