31279280

素因数分解:

$2^4\times 5^1\times {\mathrm{390991}}^1$

素因数の和:391004

約数の個数: 20

約数和(自身を含む): 72724512

約数和(自身を除く): 41445232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 390991, 781982, 1563964, 1954955, 3127928, 3909910, 6255856, 7819820, 15639640, 31279280]

約数ペア:

[(1, 31279280), (2, 15639640), (4, 7819820), (5, 6255856), (8, 3909910), (10, 3127928), (16, 1954955), (20, 1563964), (40, 781982), (80, 390991)]