20640-19-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20640-19-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,6,4 and 0 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 20640-19:
(7*2)+(6*0)+(5*6)+(4*4)+(3*0)+(2*1)+(1*9)=71
71 % 10 = 1
So 20640-19-1 is a valid CAS Registry Number.