21621680

素因数分解:

$2^4\times 5^1\times {\mathrm{270271}}^1$

素因数の和:270284

約数の個数: 20

約数和(自身を含む): 50270592

約数和(自身を除く): 28648912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270271, 540542, 1081084, 1351355, 2162168, 2702710, 4324336, 5405420, 10810840, 21621680]

約数ペア:

[(1, 21621680), (2, 10810840), (4, 5405420), (5, 4324336), (8, 2702710), (10, 2162168), (16, 1351355), (20, 1081084), (40, 540542), (80, 270271)]