51720431

素因数分解:

$7^2\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{431}}^1$

素因数の和:555

約数の個数: 24

約数和(自身を含む): 63037440

約数和(自身を除く): 11317009

約数列:

[1, 7, 31, 49, 79, 217, 431, 553, 1519, 2449, 3017, 3871, 13361, 17143, 21119, 34049, 93527, 120001, 238343, 654689, 1055519, 1668401, 7388633, 51720431]

約数ペア:

[(1, 51720431), (7, 7388633), (31, 1668401), (49, 1055519), (79, 654689), (217, 238343), (431, 120001), (553, 93527), (1519, 34049), (2449, 21119), (3017, 17143), (3871, 13361)]