639158

素因数分解:

$2^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:120

約数の個数: 24

約数和(自身を含む): 1089216

約数和(自身を除く): 450058

約数列:

[1, 2, 13, 26, 31, 61, 62, 122, 169, 338, 403, 793, 806, 1586, 1891, 3782, 5239, 10309, 10478, 20618, 24583, 49166, 319579, 639158]

約数ペア:

[(1, 639158), (2, 319579), (13, 49166), (26, 24583), (31, 20618), (61, 10478), (62, 10309), (122, 5239), (169, 3782), (338, 1891), (403, 1586), (793, 806)]