21070287

素因数分解:

$3^6\times 7^1\times {\mathrm{4129}}^1$

素因数の和:4154

約数の個数: 28

約数和(自身を含む): 36112720

約数和(自身を除く): 15042433

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1701, 4129, 5103, 12387, 28903, 37161, 86709, 111483, 260127, 334449, 780381, 1003347, 2341143, 3010041, 7023429, 21070287]

約数ペア:

[(1, 21070287), (3, 7023429), (7, 3010041), (9, 2341143), (21, 1003347), (27, 780381), (63, 334449), (81, 260127), (189, 111483), (243, 86709), (567, 37161), (729, 28903), (1701, 12387), (4129, 5103)]