128878281

素因数分解:

$3^2\times 7^2\times {\mathrm{292241}}^1$

素因数の和:292261

約数の個数: 18

約数和(自身を含む): 216551322

約数和(自身を除く): 87673041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 292241, 876723, 2045687, 2630169, 6137061, 14319809, 18411183, 42959427, 128878281]

約数ペア:

[(1, 128878281), (3, 42959427), (7, 18411183), (9, 14319809), (21, 6137061), (49, 2630169), (63, 2045687), (147, 876723), (441, 292241)]