221504255

素因数分解:

$5^1\times 7^4\times {\mathrm{18451}}^1$

素因数の和:18484

約数の個数: 20

約数和(自身を含む): 310104312

約数和(自身を除く): 88600057

約数列:

[1, 5, 7, 35, 49, 245, 343, 1715, 2401, 12005, 18451, 92255, 129157, 645785, 904099, 4520495, 6328693, 31643465, 44300851, 221504255]

約数ペア:

[(1, 221504255), (5, 44300851), (7, 31643465), (35, 6328693), (49, 4520495), (245, 904099), (343, 645785), (1715, 129157), (2401, 92255), (12005, 18451)]