20509951

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{313}}^1$

素因数の和:391

約数の個数: 32

約数和(自身を含む): 27491328

約数和(自身を除く): 6981377

約数列:

[1, 7, 11, 23, 37, 77, 161, 253, 259, 313, 407, 851, 1771, 2191, 2849, 3443, 5957, 7199, 9361, 11581, 24101, 50393, 65527, 79189, 81067, 127391, 266363, 554323, 891737, 1864541, 2929993, 20509951]

約数ペア:

[(1, 20509951), (7, 2929993), (11, 1864541), (23, 891737), (37, 554323), (77, 266363), (161, 127391), (253, 81067), (259, 79189), (313, 65527), (407, 50393), (851, 24101), (1771, 11581), (2191, 9361), (2849, 7199), (3443, 5957)]