21191265

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{27701}}^1$

素因数の和:27729

約数の個数: 24

約数和(自身を含む): 38893608

約数和(自身を除く): 17702343

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 27701, 83103, 138505, 249309, 415515, 470917, 1246545, 1412751, 2354585, 4238253, 7063755, 21191265]

約数ペア:

[(1, 21191265), (3, 7063755), (5, 4238253), (9, 2354585), (15, 1412751), (17, 1246545), (45, 470917), (51, 415515), (85, 249309), (153, 138505), (255, 83103), (765, 27701)]