81003920

素因数分解:

$2^4\times 5^1\times {\mathrm{1012549}}^1$

素因数の和:1012562

約数の個数: 20

約数和(自身を含む): 188334300

約数和(自身を除く): 107330380

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1012549, 2025098, 4050196, 5062745, 8100392, 10125490, 16200784, 20250980, 40501960, 81003920]

約数ペア:

[(1, 81003920), (2, 40501960), (4, 20250980), (5, 16200784), (8, 10125490), (10, 8100392), (16, 5062745), (20, 4050196), (40, 2025098), (80, 1012549)]