21000427947

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{313}}^1\times {\mathrm{438523}}^1$

素因数の和:438859

約数の個数: 24

約数和(自身を含む): 32220989424

約数和(自身を除く): 11220561477

約数列:

[1, 3, 9, 17, 51, 153, 313, 939, 2817, 5321, 15963, 47889, 438523, 1315569, 3946707, 7454891, 22364673, 67094019, 137257699, 411773097, 1235319291, 2333380883, 7000142649, 21000427947]

約数ペア:

[(1, 21000427947), (3, 7000142649), (9, 2333380883), (17, 1235319291), (51, 411773097), (153, 137257699), (313, 67094019), (939, 22364673), (2817, 7454891), (5321, 3946707), (15963, 1315569), (47889, 438523)]