639009

素因数分解:

$3^4\times 7^3\times {\mathrm{23}}^1$

素因数の和:56

約数の個数: 40

約数和(自身を含む): 1161600

約数和(自身を除く): 522591

約数列:

[1, 3, 7, 9, 21, 23, 27, 49, 63, 69, 81, 147, 161, 189, 207, 343, 441, 483, 567, 621, 1029, 1127, 1323, 1449, 1863, 3087, 3381, 3969, 4347, 7889, 9261, 10143, 13041, 23667, 27783, 30429, 71001, 91287, 213003, 639009]

約数ペア:

[(1, 639009), (3, 213003), (7, 91287), (9, 71001), (21, 30429), (23, 27783), (27, 23667), (49, 13041), (63, 10143), (69, 9261), (81, 7889), (147, 4347), (161, 3969), (189, 3381), (207, 3087), (343, 1863), (441, 1449), (483, 1323), (567, 1127), (621, 1029)]