20545903 has 8 divisors (see below), whose sum is σ = 23764608. Its totient is φ = 17398104.

The previous prime is 20545883. The next prime is 20545907. The reversal of 20545903 is 30954502.

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 20545903 - 2⁵ = 20545871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17101 + ... + 18262.

It is an arithmetic number, because the mean of its divisors is an integer number (2970576).

Almost surely, 2^20545903 is an apocalyptic number.

20545903 is a deficient number, since it is larger than the sum of its proper divisors (3218705).

20545903 is an equidigital number, since it uses as much as digits as its factorization.

20545903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35453.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20545903 is about 4532.7588729161. The cubic root of 20545903 is about 273.8893074108.

The spelling of 20545903 in words is "twenty million, five hundred forty-five thousand, nine hundred three".