21123128

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{1031}}^1$

素因数の和:1247

約数の個数: 32

約数和(自身を含む): 42910560

約数和(自身を除く): 21787432

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 197, 394, 788, 1031, 1576, 2062, 2561, 4124, 5122, 8248, 10244, 13403, 20488, 26806, 53612, 107224, 203107, 406214, 812428, 1624856, 2640391, 5280782, 10561564, 21123128]

約数ペア:

[(1, 21123128), (2, 10561564), (4, 5280782), (8, 2640391), (13, 1624856), (26, 812428), (52, 406214), (104, 203107), (197, 107224), (394, 53612), (788, 26806), (1031, 20488), (1576, 13403), (2062, 10244), (2561, 8248), (4124, 5122)]