21254157

素因数分解:

$3^4\times {\mathrm{257}}^1\times {\mathrm{1021}}^1$

素因数の和:1290

約数の個数: 20

約数和(自身を含む): 31904796

約数和(自身を除く): 10650639

約数列:

[1, 3, 9, 27, 81, 257, 771, 1021, 2313, 3063, 6939, 9189, 20817, 27567, 82701, 262397, 787191, 2361573, 7084719, 21254157]

約数ペア:

[(1, 21254157), (3, 7084719), (9, 2361573), (27, 787191), (81, 262397), (257, 82701), (771, 27567), (1021, 20817), (2313, 9189), (3063, 6939)]