21387321

素因数分解:

$3^4\times {\mathrm{73}}^1\times {\mathrm{3617}}^1$

素因数の和:3702

約数の個数: 20

約数和(自身を含む): 32395572

約数和(自身を除く): 11008251

約数列:

[1, 3, 9, 27, 73, 81, 219, 657, 1971, 3617, 5913, 10851, 32553, 97659, 264041, 292977, 792123, 2376369, 7129107, 21387321]

約数ペア:

[(1, 21387321), (3, 7129107), (9, 2376369), (27, 792123), (73, 292977), (81, 264041), (219, 97659), (657, 32553), (1971, 10851), (3617, 5913)]