20550503 has 4 divisors (see below), whose sum is σ = 21105960. Its totient is φ = 19995048.

The previous prime is 20550493. The next prime is 20550521. The reversal of 20550503 is 30505502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20550503 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 (20550403) 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, 277673 + ... + 277746.

It is an arithmetic number, because the mean of its divisors is an integer number (5276490).

Almost surely, 2^20550503 is an apocalyptic number.

20550503 is a deficient number, since it is larger than the sum of its proper divisors (555457).

20550503 is an equidigital number, since it uses as much as digits as its factorization.

20550503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555456.

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 20550503 is about 4533.2662617587. The cubic root of 20550503 is about 273.9097461458.

The spelling of 20550503 in words is "twenty million, five hundred fifty thousand, five hundred three".