ISBN 8020014366 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 8020014366 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: French language
ISBNas­su­med er­rorCatalogs for checking
2-08-001436-61st and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-200-1136-6seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-200-1346-67th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-200-1430-6ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-200-1436-5tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-200-3436-6sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-209-1436-6fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-230-1436-6fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-600-1436-6third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Yugoslavia
ISBNas­su­med er­rorCatalogs for checking
86-20-01436-6second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
90-200-1436-6first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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