19917655

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{151}}^1$

素因数の和:247

約数の個数: 32

約数和(自身を含む): 26615808

約数和(自身を除く): 6698153

約数列:

[1, 5, 23, 31, 37, 115, 151, 155, 185, 713, 755, 851, 1147, 3473, 3565, 4255, 4681, 5587, 5735, 17365, 23405, 26381, 27935, 107663, 128501, 131905, 173197, 538315, 642505, 865985, 3983531, 19917655]

約数ペア:

[(1, 19917655), (5, 3983531), (23, 865985), (31, 642505), (37, 538315), (115, 173197), (151, 131905), (155, 128501), (185, 107663), (713, 27935), (755, 26381), (851, 23405), (1147, 17365), (3473, 5735), (3565, 5587), (4255, 4681)]