15639640

素因数分解:

$2^3\times 5^1\times {\mathrm{390991}}^1$

素因数の和:391002

約数の個数: 16

約数和(自身を含む): 35189280

約数和(自身を除く): 19549640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 390991, 781982, 1563964, 1954955, 3127928, 3909910, 7819820, 15639640]

約数ペア:

[(1, 15639640), (2, 7819820), (4, 3909910), (5, 3127928), (8, 1954955), (10, 1563964), (20, 781982), (40, 390991)]