21208495

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{1777}}^1$

素因数の和:1831

約数の個数: 32

約数和(自身を含む): 32772096

約数和(自身を除く): 11563601

約数列:

[1, 5, 7, 11, 31, 35, 55, 77, 155, 217, 341, 385, 1085, 1705, 1777, 2387, 8885, 11935, 12439, 19547, 55087, 62195, 97735, 136829, 275435, 385609, 605957, 684145, 1928045, 3029785, 4241699, 21208495]

約数ペア:

[(1, 21208495), (5, 4241699), (7, 3029785), (11, 1928045), (31, 684145), (35, 605957), (55, 385609), (77, 275435), (155, 136829), (217, 97735), (341, 62195), (385, 55087), (1085, 19547), (1705, 12439), (1777, 11935), (2387, 8885)]