ISBN 8020710703 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 8020710703 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
0-02-871070-31st and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
1-02-078070-31st and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-02-71070-33rd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-203-1070-3fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-207-1070-1tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-207-1370-07th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-207-1570-3seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-207-5070-3sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-267-1070-3fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-207-1070-3second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-20-71000-32nd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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