20675903 has 4 divisors (see below), whose sum is σ = 20826960. Its totient is φ = 20524848.

The previous prime is 20675813. The next prime is 20675917. The reversal of 20675903 is 30957602.

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 20675903 - 2¹⁴ = 20659519 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 20675903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675923) 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, 75323 + ... + 75596.

It is an arithmetic number, because the mean of its divisors is an integer number (5206740).

Almost surely, 2^20675903 is an apocalyptic number.

20675903 is a deficient number, since it is larger than the sum of its proper divisors (151057).

20675903 is a wasteful number, since it uses less digits than its factorization.

20675903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151056.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 20675903 is about 4547.0763134128. The cubic root of 20675903 is about 274.4657528638.

The spelling of 20675903 in words is "twenty million, six hundred seventy-five thousand, nine hundred three".