19917009

素因数分解:

$3^7\times 7^1\times {\mathrm{1301}}^1$

素因数の和:1329

約数の個数: 32

約数和(自身を含む): 34164480

約数和(自身を除く): 14247471

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1301, 1701, 2187, 3903, 5103, 9107, 11709, 15309, 27321, 35127, 81963, 105381, 245889, 316143, 737667, 948429, 2213001, 2845287, 6639003, 19917009]

約数ペア:

[(1, 19917009), (3, 6639003), (7, 2845287), (9, 2213001), (21, 948429), (27, 737667), (63, 316143), (81, 245889), (189, 105381), (243, 81963), (567, 35127), (729, 27321), (1301, 15309), (1701, 11709), (2187, 9107), (3903, 5103)]