21291215

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{16831}}^1$

素因数の和:16870

約数の個数: 16

約数和(自身を含む): 29085696

約数和(自身を除く): 7794481

約数列:

[1, 5, 11, 23, 55, 115, 253, 1265, 16831, 84155, 185141, 387113, 925705, 1935565, 4258243, 21291215]

約数ペア:

[(1, 21291215), (5, 4258243), (11, 1935565), (23, 925705), (55, 387113), (115, 185141), (253, 84155), (1265, 16831)]