20641164 has 24 divisors (see below), whose sum is σ = 49717248. Its totient is φ = 6658320.

The previous prime is 20641141. The next prime is 20641207. The reversal of 20641164 is 46114602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27372 + ... + 28115.

It is an arithmetic number, because the mean of its divisors is an integer number (2071552).

Almost surely, 2^20641164 is an apocalyptic number.

It is an amenable number.

20641164 is an abundant number, since it is smaller than the sum of its proper divisors (29076084).

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

20641164 is a wasteful number, since it uses less digits than its factorization.

20641164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55525 (or 55523 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20641164 is about 4543.2547804410. The cubic root of 20641164 is about 274.3119504603.

Adding to 20641164 its reverse (46114602), we get a palindrome (66755766).

The spelling of 20641164 in words is "twenty million, six hundred forty-one thousand, one hundred sixty-four".