21800560

素因数分解:

$2^4\times 5^1\times {\mathrm{272507}}^1$

素因数の和:272520

約数の個数: 20

約数和(自身を含む): 50686488

約数和(自身を除く): 28885928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272507, 545014, 1090028, 1362535, 2180056, 2725070, 4360112, 5450140, 10900280, 21800560]

約数ペア:

[(1, 21800560), (2, 10900280), (4, 5450140), (5, 4360112), (8, 2725070), (10, 2180056), (16, 1362535), (20, 1090028), (40, 545014), (80, 272507)]