19958440

素因数分解:

$2^3\times 5^1\times {\mathrm{498961}}^1$

素因数の和:498972

約数の個数: 16

約数和(自身を含む): 44906580

約数和(自身を除く): 24948140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 498961, 997922, 1995844, 2494805, 3991688, 4989610, 9979220, 19958440]

約数ペア:

[(1, 19958440), (2, 9979220), (4, 4989610), (5, 3991688), (8, 2494805), (10, 1995844), (20, 997922), (40, 498961)]