81231740

素因数分解:

$2^2\times 5^1\times {\mathrm{127}}^1\times {\mathrm{31981}}^1$

素因数の和:32117

約数の個数: 24

約数和(自身を含む): 171935232

約数和(自身を除く): 90703492

約数列:

[1, 2, 4, 5, 10, 20, 127, 254, 508, 635, 1270, 2540, 31981, 63962, 127924, 159905, 319810, 639620, 4061587, 8123174, 16246348, 20307935, 40615870, 81231740]

約数ペア:

[(1, 81231740), (2, 40615870), (4, 20307935), (5, 16246348), (10, 8123174), (20, 4061587), (127, 639620), (254, 319810), (508, 159905), (635, 127924), (1270, 63962), (2540, 31981)]