20504233 has 4 divisors (see below), whose sum is σ = 20592468. Its totient is φ = 20416000.

The previous prime is 20504221. The next prime is 20504353. The reversal of 20504233 is 33240502.

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 1607824 + 18896409 = 1268^2 + 4347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20504233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20504233.

It is not an unprimeable number, because it can be changed into a prime (20504203) 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, 43768 + ... + 44233.

It is an arithmetic number, because the mean of its divisors is an integer number (5148117).

Almost surely, 2^20504233 is an apocalyptic number.

It is an amenable number.

20504233 is a deficient number, since it is larger than the sum of its proper divisors (88235).

20504233 is an equidigital number, since it uses as much as digits as its factorization.

20504233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88234.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20504233 is about 4528.1600015900. The cubic root of 20504233 is about 273.7040199944.

Adding to 20504233 its reverse (33240502), we get a palindrome (53744735).

The spelling of 20504233 in words is "twenty million, five hundred four thousand, two hundred thirty-three".