21381808

素因数分解:

$2^4\times 7^1\times {\mathrm{190909}}^1$

素因数の和:190924

約数の個数: 20

約数和(自身を含む): 47345680

約数和(自身を除く): 25963872

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 56, 112, 190909, 381818, 763636, 1336363, 1527272, 2672726, 3054544, 5345452, 10690904, 21381808]

約数ペア:

[(1, 21381808), (2, 10690904), (4, 5345452), (7, 3054544), (8, 2672726), (14, 1527272), (16, 1336363), (28, 763636), (56, 381818), (112, 190909)]