Almost Perfect

package main  
import (
    "fmt"
    "math"
) 

//O(akar n)
func checkPerfect(n int) string{
    countDiv :=1
    sq := int(math.Sqrt(float64(n)))
    
    for i:=2;i<=sq;i++{
        // mencari yg bisa membagi
        if n%i == 0{
           if i != n/i{
                countDiv +=n/i
            }
           countDiv +=i
        }
    }
    
    if countDiv == n {
        return fmt.Sprintf("%d perfect", n)
    }else if (int(math.Abs(float64(countDiv)-float64(n))) <= 2){
        return fmt.Sprintf("%d almost perfect",n)
    }else{
        return fmt.Sprintf("%d not perfect",n)
    }
}

func main() { 
    fmt.Println(checkPerfect(6))
}