21157288

素因数分解:

$2^3\times {\mathrm{661}}^1\times {\mathrm{4001}}^1$

素因数の和:4668

約数の個数: 16

約数和(自身を含む): 39739860

約数和(自身を除く): 18582572

約数列:

[1, 2, 4, 8, 661, 1322, 2644, 4001, 5288, 8002, 16004, 32008, 2644661, 5289322, 10578644, 21157288]

約数ペア:

[(1, 21157288), (2, 10578644), (4, 5289322), (8, 2644661), (661, 32008), (1322, 16004), (2644, 8002), (4001, 5288)]