21391305

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{673}}^1$

素因数の和:857

約数の個数: 32

約数和(自身を含む): 37140096

約数和(自身を除く): 15748791

約数列:

[1, 3, 5, 13, 15, 39, 65, 163, 195, 489, 673, 815, 2019, 2119, 2445, 3365, 6357, 8749, 10095, 10595, 26247, 31785, 43745, 109699, 131235, 329097, 548495, 1426087, 1645485, 4278261, 7130435, 21391305]

約数ペア:

[(1, 21391305), (3, 7130435), (5, 4278261), (13, 1645485), (15, 1426087), (39, 548495), (65, 329097), (163, 131235), (195, 109699), (489, 43745), (673, 31785), (815, 26247), (2019, 10595), (2119, 10095), (2445, 8749), (3365, 6357)]