20972103 has 4 divisors (see below), whose sum is σ = 27962808. Its totient is φ = 13981400.

The previous prime is 20972099. The next prime is 20972111. The reversal of 20972103 is 30127902.

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 20972103 - 2² = 20972099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3495348 + ... + 3495353.

It is an arithmetic number, because the mean of its divisors is an integer number (6990702).

Almost surely, 2^20972103 is an apocalyptic number.

20972103 is a deficient number, since it is larger than the sum of its proper divisors (6990705).

20972103 is an equidigital number, since it uses as much as digits as its factorization.

20972103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990704.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20972103 is about 4579.5308711701. The cubic root of 20972103 is about 275.7701957110.

The spelling of 20972103 in words is "twenty million, nine hundred seventy-two thousand, one hundred three".