20536 has 16 divisors (see below), whose sum is σ = 41040. Its totient is φ = 9600.

The previous prime is 20533. The next prime is 20543. The reversal of 20536 is 63502.

It is a d-powerful number, because it can be written as 2⁹ + 0 + 5³ + 3⁹ + 6³ .

It is a plaindrome in base 11.

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 (20533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61 + ... + 211.

It is an arithmetic number, because the mean of its divisors is an integer number (2565).

2²⁰⁵³⁶ is an apocalyptic number.

It is an amenable number.

20536 is a deficient number, since it is larger than the sum of its proper divisors (20504).

20536 is a wasteful number, since it uses less digits than its factorization.

20536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20536 is about 143.3038729414. The cubic root of 20536 is about 27.3845296013.

The spelling of 20536 in words is "twenty thousand, five hundred thirty-six".