Dancing with the Stars (DWTS) Season 20 can be watched on the ABC platform since it is an ABC show. You can watch it live or stream episodes on the ABC website or app with a cable provider login. Additionally, Hulu with Live TV offers live streaming of DWTS with a subscription. TV antenna is another free option to watch it live, depending on your reception quality. Disney+ does not currently offer live streaming of DWTS, though some episodes may be available for streaming after airing. In summary:

• Live and streaming episodes on ABC website/app (with cable provider)
• Hulu with Live TV subscription
• TV antenna for live viewing (free)
• Disney+ has past episodes but not live streaming for DWTS

These platforms are the main ways to watch DWTS Season 20 online or on TV as of now.