19987660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{12979}}^1$

素因数の和:13006

約数の個数: 48

約数和(自身を含む): 52335360

約数和(自身を除く): 32347700

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, 12979, 25958, 51916, 64895, 90853, 129790, 142769, 181706, 259580, 285538, 363412, 454265, 571076, 713845, 908530, 999383, 1427690, 1817060, 1998766, 2855380, 3997532, 4996915, 9993830, 19987660]

約数ペア:

[(1, 19987660), (2, 9993830), (4, 4996915), (5, 3997532), (7, 2855380), (10, 1998766), (11, 1817060), (14, 1427690), (20, 999383), (22, 908530), (28, 713845), (35, 571076), (44, 454265), (55, 363412), (70, 285538), (77, 259580), (110, 181706), (140, 142769), (154, 129790), (220, 90853), (308, 64895), (385, 51916), (770, 25958), (1540, 12979)]