21129813

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{769}}^1$

素因数の和:889

約数の個数: 24

約数和(自身を含む): 31711680

約数和(自身を除く): 10581867

約数列:

[1, 3, 9, 43, 71, 129, 213, 387, 639, 769, 2307, 3053, 6921, 9159, 27477, 33067, 54599, 99201, 163797, 297603, 491391, 2347757, 7043271, 21129813]

約数ペア:

[(1, 21129813), (3, 7043271), (9, 2347757), (43, 491391), (71, 297603), (129, 163797), (213, 99201), (387, 54599), (639, 33067), (769, 27477), (2307, 9159), (3053, 6921)]