20079 has 12 divisors (see below), whose sum is σ = 30576. Its totient is φ = 12672.

The previous prime is 20071. The next prime is 20089. The reversal of 20079 is 97002.

It is not a de Polignac number, because 20079 - 2³ = 20071 is a prime.

20079 is a Rhonda number in base 15.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159 + ... + 255.

It is an arithmetic number, because the mean of its divisors is an integer number (2548).

2²⁰⁰⁷⁹ is an apocalyptic number.

20079 is a deficient number, since it is larger than the sum of its proper divisors (10497).

20079 is a wasteful number, since it uses less digits than its factorization.

20079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 20079 is about 141.7003881434. The cubic root of 20079 is about 27.1798690434.

It can be divided in two parts, 2007 and 9, that added together give a triangular number (2016 = T₆₃).

The spelling of 20079 in words is "twenty thousand, seventy-nine".