21404080

素因数分解:

$2^4\times 5^1\times {\mathrm{267551}}^1$

素因数の和:267564

約数の個数: 20

約数和(自身を含む): 49764672

約数和(自身を除く): 28360592

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267551, 535102, 1070204, 1337755, 2140408, 2675510, 4280816, 5351020, 10702040, 21404080]

約数ペア:

[(1, 21404080), (2, 10702040), (4, 5351020), (5, 4280816), (8, 2675510), (10, 2140408), (16, 1337755), (20, 1070204), (40, 535102), (80, 267551)]