20339903 has 4 divisors (see below), whose sum is σ = 20812968. Its totient is φ = 19866840.

The previous prime is 20339857. The next prime is 20339909. The reversal of 20339903 is 30993302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20339903 - 2²² = 16145599 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 (20339909) 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, 236468 + ... + 236553.

It is an arithmetic number, because the mean of its divisors is an integer number (5203242).

Almost surely, 2^20339903 is an apocalyptic number.

20339903 is a deficient number, since it is larger than the sum of its proper divisors (473065).

20339903 is an equidigital number, since it uses as much as digits as its factorization.

20339903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473064.

The product of its (nonzero) digits is 4374, while the sum is 29.

The square root of 20339903 is about 4509.9781595923. The cubic root of 20339903 is about 272.9708628172.

The spelling of 20339903 in words is "twenty million, three hundred thirty-nine thousand, nine hundred three".