7999280

素因数分解:

$2^4\times 5^1\times {\mathrm{99991}}^1$

素因数の和:100004

約数の個数: 20

約数和(自身を含む): 18598512

約数和(自身を除く): 10599232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 99991, 199982, 399964, 499955, 799928, 999910, 1599856, 1999820, 3999640, 7999280]

約数ペア:

[(1, 7999280), (2, 3999640), (4, 1999820), (5, 1599856), (8, 999910), (10, 799928), (16, 499955), (20, 399964), (40, 199982), (80, 99991)]