Bandicam’s default naming convention is purely chronological. Breaking down your specific file:
By 2020, the .mp4 format (H.264) had become the global standard for web video. However, Bandicam often defaulted to (or was used with) the container.
: The date. In mid-2020, the world was deeply entrenched in the COVID-19 pandemic. Screen recording software saw a massive surge in utility as the world shifted to remote learning and virtual social spaces.