721780

素因数分解:

$2^2\times 5^1\times {\mathrm{151}}^1\times {\mathrm{239}}^1$

素因数の和:399

約数の個数: 24

約数和(自身を含む): 1532160

約数和(自身を除く): 810380

約数列:

[1, 2, 4, 5, 10, 20, 151, 239, 302, 478, 604, 755, 956, 1195, 1510, 2390, 3020, 4780, 36089, 72178, 144356, 180445, 360890, 721780]

約数ペア:

[(1, 721780), (2, 360890), (4, 180445), (5, 144356), (10, 72178), (20, 36089), (151, 4780), (239, 3020), (302, 2390), (478, 1510), (604, 1195), (755, 956)]