What does twenty-seven mean?

The twenty-seventh day of the lunar calendar.

Nià n means the twentieth month of the lunar calendar.

Examples of the use of 20:

1, March 26th. -Lin Qing Chueh-min's Book with His Wife

March 26(th)

The weather will be fine on February 22nd. -Ming Yuan Hongdao's Travel Notes of Man Jing

The weather improved slightly on the 22nd.

3.20 years later. -[English] Huxley and Yan Fu translated Evolution.

Twenty years later.

4. Only the 22nd emperor of the Han Dynasty, who is not sincere-Cao Cao's "Journey to Autumn Deer"

Emperor Ling of the Han Dynasty, the 22nd emperor of the Han family, is really inappropriate in employing people.