21059919

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{7027}}^1$

素因数の和:7076

約数の個数: 20

約数和(自身を含む): 32314744

約数和(自身を除く): 11254825

約数列:

[1, 3, 9, 27, 37, 81, 111, 333, 999, 2997, 7027, 21081, 63243, 189729, 259999, 569187, 779997, 2339991, 7019973, 21059919]

約数ペア:

[(1, 21059919), (3, 7019973), (9, 2339991), (27, 779997), (37, 569187), (81, 259999), (111, 189729), (333, 63243), (999, 21081), (2997, 7027)]