21399471

素因数分解:

$3^4\times {\mathrm{61}}^2\times {\mathrm{71}}^1$

素因数の和:205

約数の個数: 30

約数和(自身を含む): 32957496

約数和(自身を除く): 11558025

約数列:

[1, 3, 9, 27, 61, 71, 81, 183, 213, 549, 639, 1647, 1917, 3721, 4331, 4941, 5751, 11163, 12993, 33489, 38979, 100467, 116937, 264191, 301401, 350811, 792573, 2377719, 7133157, 21399471]

約数ペア:

[(1, 21399471), (3, 7133157), (9, 2377719), (27, 792573), (61, 350811), (71, 301401), (81, 264191), (183, 116937), (213, 100467), (549, 38979), (639, 33489), (1647, 12993), (1917, 11163), (3721, 5751), (4331, 4941)]