21461680

素因数分解:

$2^4\times 5^1\times {\mathrm{268271}}^1$

素因数の和:268284

約数の個数: 20

約数和(自身を含む): 49898592

約数和(自身を除く): 28436912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268271, 536542, 1073084, 1341355, 2146168, 2682710, 4292336, 5365420, 10730840, 21461680]

約数ペア:

[(1, 21461680), (2, 10730840), (4, 5365420), (5, 4292336), (8, 2682710), (10, 2146168), (16, 1341355), (20, 1073084), (40, 536542), (80, 268271)]