18918581

素因数分解:

${\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1$

素因数の和:161

約数の個数: 32

約数和(自身を含む): 23113728

約数和(自身を除く): 4195147

約数列:

[1, 11, 23, 37, 43, 47, 253, 407, 473, 517, 851, 989, 1081, 1591, 1739, 2021, 9361, 10879, 11891, 17501, 19129, 22231, 36593, 39997, 46483, 74777, 402523, 439967, 511313, 822547, 1719871, 18918581]

約数ペア:

[(1, 18918581), (11, 1719871), (23, 822547), (37, 511313), (43, 439967), (47, 402523), (253, 74777), (407, 46483), (473, 39997), (517, 36593), (851, 22231), (989, 19129), (1081, 17501), (1591, 11891), (1739, 10879), (2021, 9361)]