20981191

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{521}}^1\times {\mathrm{523}}^1$

素因数の和:1062

約数の個数: 16

約数和(自身を含む): 26258688

約数和(自身を除く): 5277497

約数列:

[1, 7, 11, 77, 521, 523, 3647, 3661, 5731, 5753, 40117, 40271, 272483, 1907381, 2997313, 20981191]

約数ペア:

[(1, 20981191), (7, 2997313), (11, 1907381), (77, 272483), (521, 40271), (523, 40117), (3647, 5753), (3661, 5731)]