ISBN 8020422941 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 8020422941 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: Indonesia
ISBNas­su­med er­rorCatalogs for checking
602-04-2294-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-204-2264-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-204-2294-3tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-204-2295-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-204-2894-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-204-9294-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-208-2294-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-254-2294-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-504-2294-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-904222-4-13rd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Norway
ISBNas­su­med er­rorCatalogs for checking
82-00-42294-12nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de

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