21389780

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10589}}^1$

素因数の和:10699

約数の個数: 24

約数和(自身を含む): 45367560

約数和(自身を除く): 23977780

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10589, 21178, 42356, 52945, 105890, 211780, 1069489, 2138978, 4277956, 5347445, 10694890, 21389780]

約数ペア:

[(1, 21389780), (2, 10694890), (4, 5347445), (5, 4277956), (10, 2138978), (20, 1069489), (101, 211780), (202, 105890), (404, 52945), (505, 42356), (1010, 21178), (2020, 10589)]