20405187

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{2903}}^1$

素因数の和:2991

約数の個数: 24

約数和(自身を含む): 32617728

約数和(自身を除く): 12212541

約数列:

[1, 3, 9, 11, 33, 71, 99, 213, 639, 781, 2343, 2903, 7029, 8709, 26127, 31933, 95799, 206113, 287397, 618339, 1855017, 2267243, 6801729, 20405187]

約数ペア:

[(1, 20405187), (3, 6801729), (9, 2267243), (11, 1855017), (33, 618339), (71, 287397), (99, 206113), (213, 95799), (639, 31933), (781, 26127), (2343, 8709), (2903, 7029)]