21392371

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1$

素因数の和:152

約数の個数: 48

約数和(自身を含む): 30336768

約数和(自身を除く): 8944397

約数列:

[1, 7, 11, 13, 43, 49, 71, 77, 91, 143, 301, 473, 497, 539, 559, 637, 781, 923, 1001, 2107, 3053, 3311, 3479, 3913, 5467, 6149, 6461, 7007, 10153, 21371, 23177, 27391, 33583, 38269, 39689, 43043, 45227, 71071, 149597, 235081, 277823, 301301, 436579, 497497, 1645567, 1944761, 3056053, 21392371]

約数ペア:

[(1, 21392371), (7, 3056053), (11, 1944761), (13, 1645567), (43, 497497), (49, 436579), (71, 301301), (77, 277823), (91, 235081), (143, 149597), (301, 71071), (473, 45227), (497, 43043), (539, 39689), (559, 38269), (637, 33583), (781, 27391), (923, 23177), (1001, 21371), (2107, 10153), (3053, 7007), (3311, 6461), (3479, 6149), (3913, 5467)]