19978420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{12973}}^1$

素因数の和:13000

約数の個数: 48

約数和(自身を含む): 52311168

約数和(自身を除く): 32332748

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 12973, 25946, 51892, 64865, 90811, 129730, 142703, 181622, 259460, 285406, 363244, 454055, 570812, 713515, 908110, 998921, 1427030, 1816220, 1997842, 2854060, 3995684, 4994605, 9989210, 19978420]

約数ペア:

[(1, 19978420), (2, 9989210), (4, 4994605), (5, 3995684), (7, 2854060), (10, 1997842), (11, 1816220), (14, 1427030), (20, 998921), (22, 908110), (28, 713515), (35, 570812), (44, 454055), (55, 363244), (70, 285406), (77, 259460), (110, 181622), (140, 142703), (154, 129730), (220, 90811), (308, 64865), (385, 51892), (770, 25946), (1540, 12973)]