20179 has 4 divisors (see below), whose sum is σ = 21384. Its totient is φ = 18976.

The previous prime is 20177. The next prime is 20183. The reversal of 20179 is 97102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20179 - 2¹ = 20177 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577 + ... + 610.

It is an arithmetic number, because the mean of its divisors is an integer number (5346).

2²⁰¹⁷⁹ is an apocalyptic number.

20179 is a deficient number, since it is larger than the sum of its proper divisors (1205).

20179 is a wasteful number, since it uses less digits than its factorization.

20179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20179 is about 142.0528070824. The cubic root of 20179 is about 27.2249158949.

The spelling of 20179 in words is "twenty thousand, one hundred seventy-nine".