640359

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{641}}^1$

素因数の和:687

約数の個数: 16

約数和(自身を含む): 975840

約数和(自身を除く): 335481

約数列:

[1, 3, 9, 27, 37, 111, 333, 641, 999, 1923, 5769, 17307, 23717, 71151, 213453, 640359]

約数ペア:

[(1, 640359), (3, 213453), (9, 71151), (27, 23717), (37, 17307), (111, 5769), (333, 1923), (641, 999)]