21490820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82657}}^1$

素因数の和:82679

約数の個数: 24

約数和(自身を含む): 48602904

約数和(自身を除く): 27112084

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82657, 165314, 330628, 413285, 826570, 1074541, 1653140, 2149082, 4298164, 5372705, 10745410, 21490820]

約数ペア:

[(1, 21490820), (2, 10745410), (4, 5372705), (5, 4298164), (10, 2149082), (13, 1653140), (20, 1074541), (26, 826570), (52, 413285), (65, 330628), (130, 165314), (260, 82657)]