20502903 has 4 divisors (see below), whose sum is σ = 27337208. Its totient is φ = 13668600.

The previous prime is 20502887. The next prime is 20502907. The reversal of 20502903 is 30920502.

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

It is not a de Polignac number, because 20502903 - 2⁴ = 20502887 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 20502903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502907) 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, 3417148 + ... + 3417153.

It is an arithmetic number, because the mean of its divisors is an integer number (6834302).

Almost surely, 2^20502903 is an apocalyptic number.

20502903 is a deficient number, since it is larger than the sum of its proper divisors (6834305).

20502903 is an equidigital number, since it uses as much as digits as its factorization.

20502903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834304.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20502903 is about 4528.0131404403. The cubic root of 20502903 is about 273.6981019609.

The spelling of 20502903 in words is "twenty million, five hundred two thousand, nine hundred three".