- In
number theory, an
abundant number or
excessive number is a
positive integer for
which the sum of its
proper divisors is
greater than the
number. The...
- In
number theory, a
colossally abundant number (sometimes
abbreviated as CA) is a
natural number that, in a particular,
rigorous sense, has many divisors...
- In
number theory, a
highly abundant number is a
natural number with the
property that the sum of its
divisors (including itself) is
greater than the sum...
-
primitive abundant number is an
abundant number whose proper divisors are all
deficient numbers. For example, 20 is a
primitive abundant number because:...
-
twentieth abundant and
highly abundant number (with 20 the
first primitive abundant number and 70 the second). 90 is the
third unitary perfect number (after...
-
number (7 × 11 × 13),
pentagonal number,
pentatope number,
palindromic number 1002 =
sphenic number,
Mertens function zero,
abundant number,
number of...
-
natural number following 199 and
preceding 201. 200 is an
abundant number, as 265, the sum of its
proper divisors, is
greater than itself. The
number appears...
-
semiperfect number.
Eighteen is the
first inverted square-prime of the form p·q2. In base ten, it is a
Harshad number. It is an
abundant number, as the sum...
-
whereas an
abundant number has a sum of its
proper divisors that is
larger than the
number itself.
Primitive abundant numbers are
abundant numbers whose...
- the
prime 7-aliquot tree. It is the
smallest primitive abundant number, and the
first number to have an
abundance of 2,
followed by 104. 20 is the length...