19728891

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{109}}^1$

素因数の和:165

約数の個数: 72

約数和(自身を含む): 37683360

約数和(自身を除く): 17954469

約数列:

[1, 3, 7, 9, 13, 17, 21, 39, 51, 63, 91, 109, 117, 119, 153, 169, 221, 273, 327, 357, 507, 663, 763, 819, 981, 1071, 1183, 1417, 1521, 1547, 1853, 1989, 2289, 2873, 3549, 4251, 4641, 5559, 6867, 8619, 9919, 10647, 12753, 12971, 13923, 16677, 18421, 20111, 24089, 25857, 29757, 38913, 55263, 60333, 72267, 89271, 116739, 128947, 165789, 168623, 180999, 216801, 313157, 386841, 505869, 939471, 1160523, 1517607, 2192099, 2818413, 6576297, 19728891]

約数ペア:

[(1, 19728891), (3, 6576297), (7, 2818413), (9, 2192099), (13, 1517607), (17, 1160523), (21, 939471), (39, 505869), (51, 386841), (63, 313157), (91, 216801), (109, 180999), (117, 168623), (119, 165789), (153, 128947), (169, 116739), (221, 89271), (273, 72267), (327, 60333), (357, 55263), (507, 38913), (663, 29757), (763, 25857), (819, 24089), (981, 20111), (1071, 18421), (1183, 16677), (1417, 13923), (1521, 12971), (1547, 12753), (1853, 10647), (1989, 9919), (2289, 8619), (2873, 6867), (3549, 5559), (4251, 4641)]