21008897

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{59}}^1$

素因数の和:142

約数の個数: 36

約数和(自身を含む): 27537840

約数和(自身を除く): 6528943

約数列:

[1, 7, 13, 43, 49, 59, 91, 169, 301, 413, 559, 637, 767, 1183, 2107, 2537, 2891, 3913, 5369, 7267, 8281, 9971, 17759, 27391, 32981, 37583, 50869, 69797, 124313, 230867, 356083, 428753, 488579, 1616069, 3001271, 21008897]

約数ペア:

[(1, 21008897), (7, 3001271), (13, 1616069), (43, 488579), (49, 428753), (59, 356083), (91, 230867), (169, 124313), (301, 69797), (413, 50869), (559, 37583), (637, 32981), (767, 27391), (1183, 17759), (2107, 9971), (2537, 8281), (2891, 7267), (3913, 5369)]