21387807

素因数分解:

$3^4\times 7^1\times {\mathrm{67}}^1\times {\mathrm{563}}^1$

素因数の和:649

約数の個数: 40

約数和(自身を含む): 37124736

約数和(自身を除く): 15736929

約数列:

[1, 3, 7, 9, 21, 27, 63, 67, 81, 189, 201, 469, 563, 567, 603, 1407, 1689, 1809, 3941, 4221, 5067, 5427, 11823, 12663, 15201, 35469, 37721, 37989, 45603, 106407, 113163, 264047, 319221, 339489, 792141, 1018467, 2376423, 3055401, 7129269, 21387807]

約数ペア:

[(1, 21387807), (3, 7129269), (7, 3055401), (9, 2376423), (21, 1018467), (27, 792141), (63, 339489), (67, 319221), (81, 264047), (189, 113163), (201, 106407), (469, 45603), (563, 37989), (567, 37721), (603, 35469), (1407, 15201), (1689, 12663), (1809, 11823), (3941, 5427), (4221, 5067)]