21376719

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{607}}^1$

素因数の和:676

約数の個数: 48

約数和(自身を含む): 38950912

約数和(自身を除く): 17574193

約数列:

[1, 3, 7, 9, 13, 21, 39, 43, 63, 91, 117, 129, 273, 301, 387, 559, 607, 819, 903, 1677, 1821, 2709, 3913, 4249, 5031, 5463, 7891, 11739, 12747, 23673, 26101, 35217, 38241, 55237, 71019, 78303, 165711, 182707, 234909, 339313, 497133, 548121, 1017939, 1644363, 2375191, 3053817, 7125573, 21376719]

約数ペア:

[(1, 21376719), (3, 7125573), (7, 3053817), (9, 2375191), (13, 1644363), (21, 1017939), (39, 548121), (43, 497133), (63, 339313), (91, 234909), (117, 182707), (129, 165711), (273, 78303), (301, 71019), (387, 55237), (559, 38241), (607, 35217), (819, 26101), (903, 23673), (1677, 12747), (1821, 11739), (2709, 7891), (3913, 5463), (4249, 5031)]