20611164 has 36 divisors (see below), whose sum is σ = 55946184. Its totient is φ = 5888736.

The previous prime is 20611153. The next prime is 20611169. The reversal of 20611164 is 46111602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20611164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20611169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16939 + ... + 18114.

Almost surely, 2^20611164 is an apocalyptic number.

It is an amenable number.

20611164 is an abundant number, since it is smaller than the sum of its proper divisors (35335020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20611164 is a wasteful number, since it uses less digits than its factorization.

20611164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35074 (or 35065 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20611164 is about 4539.9519821249. The cubic root of 20611164 is about 274.1789904425.

Adding to 20611164 its reverse (46111602), we get a palindrome (66722766).

The spelling of 20611164 in words is "twenty million, six hundred eleven thousand, one hundred sixty-four".