20544163 has 4 divisors (see below), whose sum is σ = 20647600. Its totient is φ = 20440728.

The previous prime is 20544119. The next prime is 20544169. The reversal of 20544163 is 36144502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20544163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20544169) 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, 51420 + ... + 51817.

It is an arithmetic number, because the mean of its divisors is an integer number (5161900).

Almost surely, 2^20544163 is an apocalyptic number.

20544163 is a deficient number, since it is larger than the sum of its proper divisors (103437).

20544163 is a wasteful number, since it uses less digits than its factorization.

20544163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103436.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20544163 is about 4532.5669327656. The cubic root of 20544163 is about 273.8815754419.

Adding to 20544163 its reverse (36144502), we get a palindrome (56688665).

The spelling of 20544163 in words is "twenty million, five hundred forty-four thousand, one hundred sixty-three".