20236 has 6 divisors (see below), whose sum is σ = 35420. Its totient is φ = 10116.

The previous prime is 20233. The next prime is 20249. The reversal of 20236 is 63202.

It is a plaindrome in base 7.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (20231) by changing a digit.

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 as a sum of consecutive naturals, namely, 2526 + ... + 2533.

2²⁰²³⁶ is an apocalyptic number.

It is an amenable number.

20236 is a deficient number, since it is larger than the sum of its proper divisors (15184).

20236 is a wasteful number, since it uses less digits than its factorization.

20236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063 (or 5061 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20236 is about 142.2532952167. The cubic root of 20236 is about 27.2505260398.

Subtracting from 20236 its product of nonzero digits (72), we obtain a square (20164 = 142²).

Adding to 20236 its reverse (63202), we get a palindrome (83438).

It can be divided in two parts, 20 and 236, that added together give a 8-th power (256 = 2⁸).

The spelling of 20236 in words is "twenty thousand, two hundred thirty-six".