20972903 has 16 divisors (see below), whose sum is σ = 25597440. Its totient is φ = 16783200.

The previous prime is 20972899. The next prime is 20972909. The reversal of 20972903 is 30927902.

It is not a de Polignac number, because 20972903 - 2² = 20972899 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 20972903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8333 + ... + 10553.

It is an arithmetic number, because the mean of its divisors is an integer number (1599840).

Almost surely, 2^20972903 is an apocalyptic number.

20972903 is a deficient number, since it is larger than the sum of its proper divisors (4624537).

20972903 is a wasteful number, since it uses less digits than its factorization.

20972903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 20972903 is about 4579.6182155285. The cubic root of 20972903 is about 275.7737021683.

The spelling of 20972903 in words is "twenty million, nine hundred seventy-two thousand, nine hundred three".