21004995

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:264

約数の個数: 48

約数和(自身を含む): 37691136

約数和(自身を除く): 16686141

約数列:

[1, 3, 5, 11, 15, 33, 55, 71, 121, 163, 165, 213, 355, 363, 489, 605, 781, 815, 1065, 1793, 1815, 2343, 2445, 3905, 5379, 8591, 8965, 11573, 11715, 19723, 25773, 26895, 34719, 42955, 57865, 59169, 98615, 127303, 128865, 173595, 295845, 381909, 636515, 1400333, 1909545, 4200999, 7001665, 21004995]

約数ペア:

[(1, 21004995), (3, 7001665), (5, 4200999), (11, 1909545), (15, 1400333), (33, 636515), (55, 381909), (71, 295845), (121, 173595), (163, 128865), (165, 127303), (213, 98615), (355, 59169), (363, 57865), (489, 42955), (605, 34719), (781, 26895), (815, 25773), (1065, 19723), (1793, 11715), (1815, 11573), (2343, 8965), (2445, 8591), (3905, 5379)]