21857521

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{349}}^1\times {\mathrm{389}}^1$

素因数の和:768

約数の個数: 16

約数和(自身を含む): 26208000

約数和(自身を除く): 4350479

約数列:

[1, 7, 23, 161, 349, 389, 2443, 2723, 8027, 8947, 56189, 62629, 135761, 950327, 3122503, 21857521]

約数ペア:

[(1, 21857521), (7, 3122503), (23, 950327), (161, 135761), (349, 62629), (389, 56189), (2443, 8947), (2723, 8027)]