21198947

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 27869184

約数和(自身を除く): 6670237

約数列:

[1, 7, 11, 31, 77, 83, 107, 217, 341, 581, 749, 913, 1177, 2387, 2573, 3317, 6391, 8239, 8881, 18011, 23219, 28303, 36487, 62167, 97691, 198121, 255409, 275311, 683837, 1927177, 3028421, 21198947]

約数ペア:

[(1, 21198947), (7, 3028421), (11, 1927177), (31, 683837), (77, 275311), (83, 255409), (107, 198121), (217, 97691), (341, 62167), (581, 36487), (749, 28303), (913, 23219), (1177, 18011), (2387, 8881), (2573, 8239), (3317, 6391)]