20405721

素因数分解:

$3^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{14503}}^1$

素因数の和:14580

約数の個数: 16

約数和(自身を含む): 31560704

約数和(自身を除く): 11154983

約数列:

[1, 3, 7, 21, 67, 201, 469, 1407, 14503, 43509, 101521, 304563, 971701, 2915103, 6801907, 20405721]

約数ペア:

[(1, 20405721), (3, 6801907), (7, 2915103), (21, 971701), (67, 304563), (201, 101521), (469, 43509), (1407, 14503)]