20285903 has 8 divisors (see below), whose sum is σ = 22280400. Its totient is φ = 18316480.

The previous prime is 20285899. The next prime is 20285921. The reversal of 20285903 is 30958202.

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 20285903 - 2² = 20285899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285933) 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, 4550 + ... + 7827.

It is an arithmetic number, because the mean of its divisors is an integer number (2785050).

Almost surely, 2^20285903 is an apocalyptic number.

20285903 is a deficient number, since it is larger than the sum of its proper divisors (1994497).

20285903 is a wasteful number, since it uses less digits than its factorization.

20285903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12537.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20285903 is about 4503.9874555776. The cubic root of 20285903 is about 272.7290804358.

The spelling of 20285903 in words is "twenty million, two hundred eighty-five thousand, nine hundred three".