20005133 has 4 divisors (see below), whose sum is σ = 20333148. Its totient is φ = 19677120.

The previous prime is 20005129. The next prime is 20005159. The reversal of 20005133 is 33150002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9259849 + 10745284 = 3043^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 20005133 - 2² = 20005129 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 (20005163) 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, 163916 + ... + 164037.

It is an arithmetic number, because the mean of its divisors is an integer number (5083287).

Almost surely, 2^20005133 is an apocalyptic number.

It is an amenable number.

20005133 is a deficient number, since it is larger than the sum of its proper divisors (328015).

20005133 is an equidigital number, since it uses as much as digits as its factorization.

20005133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328014.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 20005133 is about 4472.7098050287. The cubic root of 20005133 is about 271.4649815159.

Adding to 20005133 its reverse (33150002), we get a palindrome (53155135).

The spelling of 20005133 in words is "twenty million, five thousand, one hundred thirty-three".