638766

素因数分解:

$2^1\times 3^4\times {\mathrm{3943}}^1$

素因数の和:3957

約数の個数: 20

約数和(自身を含む): 1431672

約数和(自身を除く): 792906

約数列:

[1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 3943, 7886, 11829, 23658, 35487, 70974, 106461, 212922, 319383, 638766]

約数ペア:

[(1, 638766), (2, 319383), (3, 212922), (6, 106461), (9, 70974), (18, 35487), (27, 23658), (54, 11829), (81, 7886), (162, 3943)]