21987147

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1873}}^1$

素因数の和:1939

約数の個数: 32

約数和(自身を含む): 36940288

約数和(自身を除く): 14953141

約数列:

[1, 3, 7, 13, 21, 39, 43, 91, 129, 273, 301, 559, 903, 1677, 1873, 3913, 5619, 11739, 13111, 24349, 39333, 73047, 80539, 170443, 241617, 511329, 563773, 1047007, 1691319, 3141021, 7329049, 21987147]

約数ペア:

[(1, 21987147), (3, 7329049), (7, 3141021), (13, 1691319), (21, 1047007), (39, 563773), (43, 511329), (91, 241617), (129, 170443), (273, 80539), (301, 73047), (559, 39333), (903, 24349), (1677, 13111), (1873, 11739), (3913, 5619)]