20504443 has 4 divisors (see below), whose sum is σ = 20734920. Its totient is φ = 20273968.

The previous prime is 20504437. The next prime is 20504453. The reversal of 20504443 is 34440502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20504443 - 2⁵ = 20504411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20504413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115105 + ... + 115282.

It is an arithmetic number, because the mean of its divisors is an integer number (5183730).

Almost surely, 2^20504443 is an apocalyptic number.

20504443 is a deficient number, since it is larger than the sum of its proper divisors (230477).

20504443 is an equidigital number, since it uses as much as digits as its factorization.

20504443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230476.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20504443 is about 4528.1831897572. The cubic root of 20504443 is about 273.7049543974.

Adding to 20504443 its reverse (34440502), we get a palindrome (54944945).

The spelling of 20504443 in words is "twenty million, five hundred four thousand, four hundred forty-three".