20641133 has 4 divisors (see below), whose sum is σ = 21307008. Its totient is φ = 19975260.

The previous prime is 20641129. The next prime is 20641139. The reversal of 20641133 is 33114602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20641133 - 2² = 20641129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641139) 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, 332891 + ... + 332952.

It is an arithmetic number, because the mean of its divisors is an integer number (5326752).

Almost surely, 2^20641133 is an apocalyptic number.

It is an amenable number.

20641133 is a deficient number, since it is larger than the sum of its proper divisors (665875).

20641133 is an equidigital number, since it uses as much as digits as its factorization.

20641133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665874.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20641133 is about 4543.2513687887. The cubic root of 20641133 is about 274.3118131348.

Adding to 20641133 its reverse (33114602), we get a palindrome (53755735).

The spelling of 20641133 in words is "twenty million, six hundred forty-one thousand, one hundred thirty-three".