19986785

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{109}}^1$

素因数の和:178

約数の個数: 48

約数和(自身を含む): 30919680

約数和(自身を除く): 10932895

約数列:

[1, 5, 7, 13, 31, 35, 65, 91, 109, 155, 169, 217, 403, 455, 545, 763, 845, 1085, 1183, 1417, 2015, 2821, 3379, 3815, 5239, 5915, 7085, 9919, 14105, 16895, 18421, 23653, 26195, 36673, 43927, 49595, 92105, 118265, 128947, 183365, 219635, 307489, 571051, 644735, 1537445, 2855255, 3997357, 19986785]

約数ペア:

[(1, 19986785), (5, 3997357), (7, 2855255), (13, 1537445), (31, 644735), (35, 571051), (65, 307489), (91, 219635), (109, 183365), (155, 128947), (169, 118265), (217, 92105), (403, 49595), (455, 43927), (545, 36673), (763, 26195), (845, 23653), (1085, 18421), (1183, 16895), (1417, 14105), (2015, 9919), (2821, 7085), (3379, 5915), (3815, 5239)]