19984040

素因数分解:

$2^3\times 5^1\times {\mathrm{499601}}^1$

素因数の和:499612

約数の個数: 16

約数和(自身を含む): 44964180

約数和(自身を除く): 24980140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499601, 999202, 1998404, 2498005, 3996808, 4996010, 9992020, 19984040]

約数ペア:

[(1, 19984040), (2, 9992020), (4, 4996010), (5, 3996808), (8, 2498005), (10, 1998404), (20, 999202), (40, 499601)]