21306887

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{997}}^1$

素因数の和:1118

約数の個数: 16

約数和(自身を含む): 25293312

約数和(自身を除く): 3986425

約数列:

[1, 7, 43, 71, 301, 497, 997, 3053, 6979, 21371, 42871, 70787, 300097, 495509, 3043841, 21306887]

約数ペア:

[(1, 21306887), (7, 3043841), (43, 495509), (71, 300097), (301, 70787), (497, 42871), (997, 21371), (3053, 6979)]