20403003 has 4 divisors (see below), whose sum is σ = 27204008. Its totient is φ = 13602000.

The previous prime is 20402981. The next prime is 20403007. The reversal of 20403003 is 30030402.

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

It is not a de Polignac number, because 20403003 - 2⁵ = 20402971 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 20403003.

It is not an unprimeable number, because it can be changed into a prime (20403007) 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, 3400498 + ... + 3400503.

It is an arithmetic number, because the mean of its divisors is an integer number (6801002).

Almost surely, 2^20403003 is an apocalyptic number.

20403003 is a deficient number, since it is larger than the sum of its proper divisors (6801005).

20403003 is an equidigital number, since it uses as much as digits as its factorization.

20403003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801004.

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20403003 is about 4516.9683417089. The cubic root of 20403003 is about 273.2528484360.

Adding to 20403003 its reverse (30030402), we get a palindrome (50433405).

The spelling of 20403003 in words is "twenty million, four hundred three thousand, three".