ISBN 8020401884 hat failed the check­sum digit test.

The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 8020401884 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, and whether any book is listed for the respective URL. To the home page
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Tiu ĉi paĝo en Esperanto (Unikodo)
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-02-040188-4first digit was chan­ged.
ISBN prefix group: Japan
ISBNas­su­med er­rorCatalogs for checking
4-02-040188-81st and 10th digits were swap­ped.
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-204-0178-4eighth digit was chan­ged.
80-204-0181-4ninth digit was chan­ged.
80-204-0188-1tenth digit was chan­ged.
80-204-0388-4seven­th digit was chan­ged.
80-204-6188-4sixth digit was chan­ged.
80-209-0188-4fifth digit was chan­ged.
80-294-0188-4fourth digit was chan­ged.
80-304-0188-4third digit was chan­ged.
80-8040-128-43rd and 8th digits were swap­ped.
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-20-40188-4second digit was chan­ged.

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