18642905

素因数分解:

$5^1\times {\mathrm{41}}^1\times {\mathrm{211}}^1\times {\mathrm{431}}^1$

素因数の和:688

約数の個数: 16

約数和(自身を含む): 23079168

約数和(自身を除く): 4436263

約数列:

[1, 5, 41, 205, 211, 431, 1055, 2155, 8651, 17671, 43255, 88355, 90941, 454705, 3728581, 18642905]

約数ペア:

[(1, 18642905), (5, 3728581), (41, 454705), (205, 90941), (211, 88355), (431, 43255), (1055, 17671), (2155, 8651)]