20045503 has 4 divisors (see below), whose sum is σ = 20055240. Its totient is φ = 20035768.

The previous prime is 20045497. The next prime is 20045507. The reversal of 20045503 is 30554002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20045503 - 2⁵ = 20045471 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 (20045507) 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, 433 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (5013810).

Almost surely, 2^20045503 is an apocalyptic number.

20045503 is a deficient number, since it is larger than the sum of its proper divisors (9737).

20045503 is an equidigital number, since it uses as much as digits as its factorization.

20045503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9736.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20045503 is about 4477.2204547018. The cubic root of 20045503 is about 271.6474626461.

Adding to 20045503 its reverse (30554002), we get a palindrome (50599505).

The spelling of 20045503 in words is "twenty million, forty-five thousand, five hundred three".