First, you should, with that many (96) packages waiting for update, run `sudo apt update && sudo apt upgrade' to get the system fully updated. (you said you did the update but failed to mention the upgrade)
Second, a 404 error is "not found" meaning the page (document) is not found on that server.
Code:
E: Failed to fetch http://security.debian.org/pool/updates/main/a/apache2/apache2-bin_2.4.38-3+deb10u3_i386.deb 404 Not Found [IP: 199.232.190.132 443]
E: Failed to fetch http://security.debian.org/pool/updates/main/a/apache2/apache2-data_2.4.38-3+deb10u3_all.deb 404 Not Found [IP: 199.232.190.132 443]
E: Failed to fetch http://security.debian.org/pool/updates/main/a/apache2/apache2-utils_2.4.38-3+deb10u3_i386.deb 404 Not Found [IP: 199.232.190.132 443]
E: Failed to fetch http://security.debian.org/pool/updates/main/a/apache2/apache2_2.4.38-3+deb10u3_i386.deb 404 Not Found [IP: 199.232.190.132 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
these errors tell you exactly what package and what the results were.
I can verify that my system will also not find those packages at that site. Maybe the package is not available? Maybe it is not at that repo? Someone who uses a 32 bit system may be able to assist.