19780215

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{337}}^1$

素因数の和:408

約数の個数: 64

約数和(自身を含む): 39975936

約数和(自身を除く): 20195721

約数列:

[1, 3, 5, 7, 13, 15, 21, 35, 39, 43, 65, 91, 105, 129, 195, 215, 273, 301, 337, 455, 559, 645, 903, 1011, 1365, 1505, 1677, 1685, 2359, 2795, 3913, 4381, 4515, 5055, 7077, 8385, 11739, 11795, 13143, 14491, 19565, 21905, 30667, 35385, 43473, 58695, 65715, 72455, 92001, 101437, 153335, 188383, 217365, 304311, 460005, 507185, 565149, 941915, 1318681, 1521555, 2825745, 3956043, 6593405, 19780215]

約数ペア:

[(1, 19780215), (3, 6593405), (5, 3956043), (7, 2825745), (13, 1521555), (15, 1318681), (21, 941915), (35, 565149), (39, 507185), (43, 460005), (65, 304311), (91, 217365), (105, 188383), (129, 153335), (195, 101437), (215, 92001), (273, 72455), (301, 65715), (337, 58695), (455, 43473), (559, 35385), (645, 30667), (903, 21905), (1011, 19565), (1365, 14491), (1505, 13143), (1677, 11795), (1685, 11739), (2359, 8385), (2795, 7077), (3913, 5055), (4381, 4515)]