MATHS: what's a number called if it's equal to the sum of its divisors other than itself?

Questions

Albums 2002, Shakiras album reached the top 10 uk chart?

Albums 2002, Vanessa Carltons UK top 10 album?

Tropical american trees yielding large round fruits that are also known as bottle gourds?

Name of one of the seven dwarfs?

Another name for graphite or black lead?