4 ms Java Solution

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    public String numberToWords(int num) {
            if(num==0) {
                return "Zero";
            return helper(num);
        public String helper(int num) {
            String[] words = new String[] {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine",
            "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
            StringBuilder res = new StringBuilder();
            if(num>=1000000000) {
                res.append(helper(num/1000000000)).append(" Billion ").append(helper(num%1000000000));
            } else if(num>=1000000) {
                res.append(helper(num/1000000)).append(" Million ").append(helper(num%1000000));
            } else if(num>=1000) {
                res.append(helper(num/1000)).append(" Thousand ").append(helper(num%1000));
            } else if(num>=100) {
                res.append(helper(num/100)).append(" Hundred ").append(helper(num%100));
            } else if(num>=20) {
                res.append(words[(num-20)/10+20]).append(" ").append(words[num%10]);
            } else {
            return res.toString().trim();

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