21978639

素因数分解:

$3^2\times {\mathrm{23}}^1\times {\mathrm{89}}^1\times {\mathrm{1193}}^1$

素因数の和:1311

約数の個数: 24

約数和(自身を含む): 33527520

約数和(自身を除く): 11548881

約数列:

[1, 3, 9, 23, 69, 89, 207, 267, 801, 1193, 2047, 3579, 6141, 10737, 18423, 27439, 82317, 106177, 246951, 318531, 955593, 2442071, 7326213, 21978639]

約数ペア:

[(1, 21978639), (3, 7326213), (9, 2442071), (23, 955593), (69, 318531), (89, 246951), (207, 106177), (267, 82317), (801, 27439), (1193, 18423), (2047, 10737), (3579, 6141)]