638761509

素因数分解:

$3^2\times {\mathrm{41}}^2\times {\mathrm{42221}}^1$

素因数の和:42309

約数の個数: 18

約数和(自身を含む): 945730578

約数和(自身を除く): 306969069

約数列:

[1, 3, 9, 41, 123, 369, 1681, 5043, 15129, 42221, 126663, 379989, 1731061, 5193183, 15579549, 70973501, 212920503, 638761509]

約数ペア:

[(1, 638761509), (3, 212920503), (9, 70973501), (41, 15579549), (123, 5193183), (369, 1731061), (1681, 379989), (5043, 126663), (15129, 42221)]