At least 20 people have been confirmed dead and seven others are still missing since the rain-triggered floods hit the southern Chinese province of Guangdong on Friday, local authorities said Sunday.

The aerial veiw shows the flood-battered Longguo town in Zijin county in South China's Guangdong province on Aug 18, 2013.[Photo/Xinhua]

More than 500,000 people were evacuated and about four million people were affected in the floods, according to the department.

The average precipitation between 8 p.m. on Friday to 8 a.m. on Sunday reached 324 mm in Puning, which triggered flash floods and rising water levels of rivers and reserviors.

The economic loss in Puning was estimated to be about 600 million yuan (97.3 million U.S. dollars).

In Zijin County, water and power supply as well as communication were cut off in the townships of Longwo, Suqu and Shuidun.

A total of 61 reservoirs have reported water levels surpassing the danger lines by Sunday evening, according to the Guangdong provincial flood control and drought relief headquarters.

More than 2,800 soldiers are participating in the relief efforts.