21220265

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{8209}}^1$

素因数の和:8272

約数の個数: 16

約数和(自身を含む): 28373760

約数和(自身を除く): 7153495

約数列:

[1, 5, 11, 47, 55, 235, 517, 2585, 8209, 41045, 90299, 385823, 451495, 1929115, 4244053, 21220265]

約数ペア:

[(1, 21220265), (5, 4244053), (11, 1929115), (47, 451495), (55, 385823), (235, 90299), (517, 41045), (2585, 8209)]