81247780

素因数分解:

$2^2\times 5^1\times {\mathrm{691}}^1\times {\mathrm{5879}}^1$

素因数の和:6579

約数の個数: 24

約数和(自身を含む): 170896320

約数和(自身を除く): 89648540

約数列:

[1, 2, 4, 5, 10, 20, 691, 1382, 2764, 3455, 5879, 6910, 11758, 13820, 23516, 29395, 58790, 117580, 4062389, 8124778, 16249556, 20311945, 40623890, 81247780]

約数ペア:

[(1, 81247780), (2, 40623890), (4, 20311945), (5, 16249556), (10, 8124778), (20, 4062389), (691, 117580), (1382, 58790), (2764, 29395), (3455, 23516), (5879, 13820), (6910, 11758)]