21839780

素因数分解:

$2^2\times 5^1\times {\mathrm{1039}}^1\times {\mathrm{1051}}^1$

素因数の和:2099

約数の個数: 24

約数和(自身を含む): 45951360

約数和(自身を除く): 24111580

約数列:

[1, 2, 4, 5, 10, 20, 1039, 1051, 2078, 2102, 4156, 4204, 5195, 5255, 10390, 10510, 20780, 21020, 1091989, 2183978, 4367956, 5459945, 10919890, 21839780]

約数ペア:

[(1, 21839780), (2, 10919890), (4, 5459945), (5, 4367956), (10, 2183978), (20, 1091989), (1039, 21020), (1051, 20780), (2078, 10510), (2102, 10390), (4156, 5255), (4204, 5195)]