20001133 has 4 divisors (see below), whose sum is σ = 20056000. Its totient is φ = 19946268.

The previous prime is 20001083. The next prime is 20001139. The reversal of 20001133 is 33110002.

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 20001133 - 2⁹ = 20000621 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 (20001139) 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, 26883 + ... + 27616.

It is an arithmetic number, because the mean of its divisors is an integer number (5014000).

Almost surely, 2^20001133 is an apocalyptic number.

It is an amenable number.

20001133 is a deficient number, since it is larger than the sum of its proper divisors (54867).

20001133 is an equidigital number, since it uses as much as digits as its factorization.

20001133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54866.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20001133 is about 4472.2626264565. The cubic root of 20001133 is about 271.4468872880.

Adding to 20001133 its reverse (33110002), we get a palindrome (53111135).

The spelling of 20001133 in words is "twenty million, one thousand, one hundred thirty-three".