ISBN 8090004020 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 8090004020 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
0-09-008402-01st and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Japan
ISBNas­su­med er­rorCatalogs for checking
4-09-000402-0first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-00-90402-03rd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-400-0402-0third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900040-2-4tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900040-4-0ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900045-2-0eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900050-2-0seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900340-2-0sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900400-2-06th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-908040-2-0fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Korea, Republic
ISBNas­su­med er­rorCatalogs for checking
89-90004-02-0second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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