1290959980

素因数分解:

$2^2\times 5^1\times {\mathrm{64547999}}^1$

素因数の和:64548008

約数の個数: 12

約数和(自身を含む): 2711016000

約数和(自身を除く): 1420056020

約数列:

[1, 2, 4, 5, 10, 20, 64547999, 129095998, 258191996, 322739995, 645479990, 1290959980]

約数ペア:

[(1, 1290959980), (2, 645479990), (4, 322739995), (5, 258191996), (10, 129095998), (20, 64547999)]