21287691

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{7103}}^1$

素因数の和:7152

約数の個数: 20

約数和(自身を含む): 32664192

約数和(自身を除く): 11376501

約数列:

[1, 3, 9, 27, 37, 81, 111, 333, 999, 2997, 7103, 21309, 63927, 191781, 262811, 575343, 788433, 2365299, 7095897, 21287691]

約数ペア:

[(1, 21287691), (3, 7095897), (9, 2365299), (27, 788433), (37, 575343), (81, 262811), (111, 191781), (333, 63927), (999, 21309), (2997, 7103)]