15991120

素因数分解:

$2^4\times 5^1\times {\mathrm{199889}}^1$

素因数の和:199902

約数の個数: 20

約数和(自身を含む): 37179540

約数和(自身を除く): 21188420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199889, 399778, 799556, 999445, 1599112, 1998890, 3198224, 3997780, 7995560, 15991120]

約数ペア:

[(1, 15991120), (2, 7995560), (4, 3997780), (5, 3198224), (8, 1998890), (10, 1599112), (16, 999445), (20, 799556), (40, 399778), (80, 199889)]