21278765

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{5209}}^1$

素因数の和:5276

約数の個数: 16

約数和(自身を含む): 27508800

約数和(自身を除く): 6230035

約数列:

[1, 5, 19, 43, 95, 215, 817, 4085, 5209, 26045, 98971, 223987, 494855, 1119935, 4255753, 21278765]

約数ペア:

[(1, 21278765), (5, 4255753), (19, 1119935), (43, 494855), (95, 223987), (215, 98971), (817, 26045), (4085, 5209)]