20003903 has 8 divisors (see below), whose sum is σ = 21099120. Its totient is φ = 18912960.

The previous prime is 20003899. The next prime is 20003909. The reversal of 20003903 is 30930002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20003903 - 2² = 20003899 is a prime.

It is a super-2 number, since 2×20003903² = 800312270466818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20003909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14483 + ... + 15803.

It is an arithmetic number, because the mean of its divisors is an integer number (2637390).

Almost surely, 2^20003903 is an apocalyptic number.

20003903 is a deficient number, since it is larger than the sum of its proper divisors (1095217).

20003903 is a wasteful number, since it uses less digits than its factorization.

20003903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 20003903 is about 4472.5723023781. The cubic root of 20003903 is about 271.4594177976.

Adding to 20003903 its reverse (30930002), we get a palindrome (50933905).

The spelling of 20003903 in words is "twenty million, three thousand, nine hundred three".