21407895

素因数分解:

$3^4\times 5^1\times {\mathrm{52859}}^1$

素因数の和:52876

約数の個数: 20

約数和(自身を含む): 38376360

約数和(自身を除く): 16968465

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52859, 158577, 264295, 475731, 792885, 1427193, 2378655, 4281579, 7135965, 21407895]

約数ペア:

[(1, 21407895), (3, 7135965), (5, 4281579), (9, 2378655), (15, 1427193), (27, 792885), (45, 475731), (81, 264295), (135, 158577), (405, 52859)]