19901555

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{2837}}^1$

素因数の和:2926

約数の個数: 16

約数和(自身を含む): 25337664

約数和(自身を除く): 5436109

約数列:

[1, 5, 23, 61, 115, 305, 1403, 2837, 7015, 14185, 65251, 173057, 326255, 865285, 3980311, 19901555]

約数ペア:

[(1, 19901555), (5, 3980311), (23, 865285), (61, 326255), (115, 173057), (305, 65251), (1403, 14185), (2837, 7015)]