21082940

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5351}}^1$

素因数の和:5557

約数の個数: 24

約数和(自身を含む): 44507232

約数和(自身を除く): 23424292

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5351, 10702, 21404, 26755, 53510, 107020, 1054147, 2108294, 4216588, 5270735, 10541470, 21082940]

約数ペア:

[(1, 21082940), (2, 10541470), (4, 5270735), (5, 4216588), (10, 2108294), (20, 1054147), (197, 107020), (394, 53510), (788, 26755), (985, 21404), (1970, 10702), (3940, 5351)]