The number 30 is a semiperfect number -- one that is equal to the sum of some, but not all, of its factors.
원문출처 : https://www.cnn.com/2022/05/16/football/barcelona-femeni-perfect-season-spt-intl/index.html
원문출처 : https://www.cnn.com/2022/05/16/football/barcelona-femeni-perfect-season-spt-intl/index.html