21135919

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{43}}^2\times {\mathrm{71}}^1$

素因数の和:187

約数の個数: 24

約数和(自身を含む): 26168832

約数和(自身を除く): 5032913

約数列:

[1, 7, 23, 43, 71, 161, 301, 497, 989, 1633, 1849, 3053, 6923, 11431, 12943, 21371, 42527, 70219, 131279, 297689, 491533, 918953, 3019417, 21135919]

約数ペア:

[(1, 21135919), (7, 3019417), (23, 918953), (43, 491533), (71, 297689), (161, 131279), (301, 70219), (497, 42527), (989, 21371), (1633, 12943), (1849, 11431), (3053, 6923)]