Program to find sum of digits in TSQL

;WITH getDigitsCTE AS (
    SELECT 
	  Quotient = @Number / 10 
      ,Remainder = @Number % 10  

    UNION ALL

    SELECT 
       Quotient / 10
       , Quotient % 10

    FROM getDigitsCTE

    WHERE Quotient > 0
)

SELECT 
       [Sum of digits]=SUM(Remainder)
FROM getDigitsCTE