21872825

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{167}}^1$

素因数の和:234

約数の個数: 36

約数和(自身を含む): 30498048

約数和(自身を除く): 8625223

約数列:

[1, 5, 13, 25, 31, 65, 155, 167, 169, 325, 403, 775, 835, 845, 2015, 2171, 4175, 4225, 5177, 5239, 10075, 10855, 25885, 26195, 28223, 54275, 67301, 129425, 130975, 141115, 336505, 705575, 874913, 1682525, 4374565, 21872825]

約数ペア:

[(1, 21872825), (5, 4374565), (13, 1682525), (25, 874913), (31, 705575), (65, 336505), (155, 141115), (167, 130975), (169, 129425), (325, 67301), (403, 54275), (775, 28223), (835, 26195), (845, 25885), (2015, 10855), (2171, 10075), (4175, 5239), (4225, 5177)]