19819640

素因数分解:

$2^3\times 5^1\times {\mathrm{495491}}^1$

素因数の和:495502

約数の個数: 16

約数和(自身を含む): 44594280

約数和(自身を除く): 24774640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 495491, 990982, 1981964, 2477455, 3963928, 4954910, 9909820, 19819640]

約数ペア:

[(1, 19819640), (2, 9909820), (4, 4954910), (5, 3963928), (8, 2477455), (10, 1981964), (20, 990982), (40, 495491)]