ISBN 8020609719 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 8020609719 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: English language
ISBNas­su­med er­rorCatalogs for checking
0-02-860971-91st and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-02-60971-93rd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-202-0971-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-206-0371-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-206-0791-97th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-206-0970-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-206-0971-7tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-206-4971-9sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-206-9071-96th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-266-0971-9fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-206-0971-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-20-60901-92nd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
90-206-0971-81st and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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