81900455

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{180001}}^1$

素因数の和:180026

約数の個数: 16

約数和(自身を含む): 120961344

約数和(自身を除く): 39060889

約数列:

[1, 5, 7, 13, 35, 65, 91, 455, 180001, 900005, 1260007, 2340013, 6300035, 11700065, 16380091, 81900455]

約数ペア:

[(1, 81900455), (5, 16380091), (7, 11700065), (13, 6300035), (35, 2340013), (65, 1260007), (91, 900005), (455, 180001)]