20056 has 16 divisors (see below), whose sum is σ = 39600. Its totient is φ = 9504.

The previous prime is 20051. The next prime is 20063. The reversal of 20056 is 65002.

20056 is nontrivially palindromic in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20051) by changing a digit.

20056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130 + ... + 238.

It is an arithmetic number, because the mean of its divisors is an integer number (2475).

2²⁰⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

20056 is a deficient number, since it is larger than the sum of its proper divisors (19544).

20056 is a wasteful number, since it uses less digits than its factorization.

20056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20056 is about 141.6192077368. The cubic root of 20056 is about 27.1694871215.

Adding to 20056 its reverse (65002), we get a palindrome (85058).

It can be divided in two parts, 200 and 56, that added together give a 8-th power (256 = 2⁸).

The spelling of 20056 in words is "twenty thousand, fifty-six".