21084280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{257}}^1\times {\mathrm{293}}^1$

素因数の和:568

約数の個数: 64

約数和(自身を含む): 54613440

約数和(自身を除く): 33529160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 257, 280, 293, 514, 586, 1028, 1172, 1285, 1465, 1799, 2051, 2056, 2344, 2570, 2930, 3598, 4102, 5140, 5860, 7196, 8204, 8995, 10255, 10280, 11720, 14392, 16408, 17990, 20510, 35980, 41020, 71960, 75301, 82040, 150602, 301204, 376505, 527107, 602408, 753010, 1054214, 1506020, 2108428, 2635535, 3012040, 4216856, 5271070, 10542140, 21084280]

約数ペア:

[(1, 21084280), (2, 10542140), (4, 5271070), (5, 4216856), (7, 3012040), (8, 2635535), (10, 2108428), (14, 1506020), (20, 1054214), (28, 753010), (35, 602408), (40, 527107), (56, 376505), (70, 301204), (140, 150602), (257, 82040), (280, 75301), (293, 71960), (514, 41020), (586, 35980), (1028, 20510), (1172, 17990), (1285, 16408), (1465, 14392), (1799, 11720), (2051, 10280), (2056, 10255), (2344, 8995), (2570, 8204), (2930, 7196), (3598, 5860), (4102, 5140)]