21581021

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{40039}}^1$

素因数の和:40064

約数の個数: 12

約数和(自身を含む): 27387360

約数和(自身を除く): 5806339

約数列:

[1, 7, 11, 49, 77, 539, 40039, 280273, 440429, 1961911, 3083003, 21581021]

約数ペア:

[(1, 21581021), (7, 3083003), (11, 1961911), (49, 440429), (77, 280273), (539, 40039)]