21287915

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{293}}^1\times {\mathrm{1321}}^1$

素因数の和:1630

約数の個数: 16

約数和(自身を含む): 27984096

約数和(自身を除く): 6696181

約数列:

[1, 5, 11, 55, 293, 1321, 1465, 3223, 6605, 14531, 16115, 72655, 387053, 1935265, 4257583, 21287915]

約数ペア:

[(1, 21287915), (5, 4257583), (11, 1935265), (55, 387053), (293, 72655), (1321, 16115), (1465, 14531), (3223, 6605)]