81431120

素因数分解:

$2^4\times 5^1\times {\mathrm{1017889}}^1$

素因数の和:1017902

約数の個数: 20

約数和(自身を含む): 189327540

約数和(自身を除く): 107896420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1017889, 2035778, 4071556, 5089445, 8143112, 10178890, 16286224, 20357780, 40715560, 81431120]

約数ペア:

[(1, 81431120), (2, 40715560), (4, 20357780), (5, 16286224), (8, 10178890), (10, 8143112), (16, 5089445), (20, 4071556), (40, 2035778), (80, 1017889)]