19997439

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{149}}^1$

素因数の和:260

約数の個数: 48

約数和(自身を含む): 34473600

約数和(自身を除く): 14476161

約数列:

[1, 3, 7, 11, 21, 33, 49, 77, 83, 147, 149, 231, 249, 447, 539, 581, 913, 1043, 1617, 1639, 1743, 2739, 3129, 4067, 4917, 6391, 7301, 11473, 12201, 12367, 19173, 21903, 34419, 37101, 44737, 80311, 86569, 134211, 136037, 240933, 259707, 408111, 605983, 952259, 1817949, 2856777, 6665813, 19997439]

約数ペア:

[(1, 19997439), (3, 6665813), (7, 2856777), (11, 1817949), (21, 952259), (33, 605983), (49, 408111), (77, 259707), (83, 240933), (147, 136037), (149, 134211), (231, 86569), (249, 80311), (447, 44737), (539, 37101), (581, 34419), (913, 21903), (1043, 19173), (1617, 12367), (1639, 12201), (1743, 11473), (2739, 7301), (3129, 6391), (4067, 4917)]