99991900

素因数分解:

$2^2\times 5^2\times {\mathrm{991}}^1\times {\mathrm{1009}}^1$

素因数の和:2014

約数の個数: 36

約数和(自身を含む): 217416640

約数和(自身を除く): 117424740

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 991, 1009, 1982, 2018, 3964, 4036, 4955, 5045, 9910, 10090, 19820, 20180, 24775, 25225, 49550, 50450, 99100, 100900, 999919, 1999838, 3999676, 4999595, 9999190, 19998380, 24997975, 49995950, 99991900]

約数ペア:

[(1, 99991900), (2, 49995950), (4, 24997975), (5, 19998380), (10, 9999190), (20, 4999595), (25, 3999676), (50, 1999838), (100, 999919), (991, 100900), (1009, 99100), (1982, 50450), (2018, 49550), (3964, 25225), (4036, 24775), (4955, 20180), (5045, 19820), (9910, 10090)]