28142721

素因数分解:

$3^4\times {\mathrm{157}}^1\times {\mathrm{2213}}^1$

素因数の和:2382

約数の個数: 20

約数和(自身を含む): 42327252

約数和(自身を除く): 14184531

約数列:

[1, 3, 9, 27, 81, 157, 471, 1413, 2213, 4239, 6639, 12717, 19917, 59751, 179253, 347441, 1042323, 3126969, 9380907, 28142721]

約数ペア:

[(1, 28142721), (3, 9380907), (9, 3126969), (27, 1042323), (81, 347441), (157, 179253), (471, 59751), (1413, 19917), (2213, 12717), (4239, 6639)]