21281840

素因数分解:

$2^4\times 5^1\times {\mathrm{266023}}^1$

素因数の和:266036

約数の個数: 20

約数和(自身を含む): 49480464

約数和(自身を除く): 28198624

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266023, 532046, 1064092, 1330115, 2128184, 2660230, 4256368, 5320460, 10640920, 21281840]

約数ペア:

[(1, 21281840), (2, 10640920), (4, 5320460), (5, 4256368), (8, 2660230), (10, 2128184), (16, 1330115), (20, 1064092), (40, 532046), (80, 266023)]