21321955

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{151}}^1\times {\mathrm{911}}^1$

素因数の和:1098

約数の個数: 16

約数和(自身を含む): 26615808

約数和(自身を除く): 5293853

約数列:

[1, 5, 31, 151, 155, 755, 911, 4555, 4681, 23405, 28241, 137561, 141205, 687805, 4264391, 21321955]

約数ペア:

[(1, 21321955), (5, 4264391), (31, 687805), (151, 141205), (155, 137561), (755, 28241), (911, 23405), (4555, 4681)]