990009

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{991}}^1$

素因数の和:1037

約数の個数: 16

約数和(自身を含む): 1507840

約数和(自身を除く): 517831

約数列:

[1, 3, 9, 27, 37, 111, 333, 991, 999, 2973, 8919, 26757, 36667, 110001, 330003, 990009]

約数ペア:

[(1, 990009), (3, 330003), (9, 110001), (27, 36667), (37, 26757), (111, 8919), (333, 2973), (991, 999)]