20975223 has 4 divisors (see below), whose sum is σ = 27966968. Its totient is φ = 13983480.

The previous prime is 20975219. The next prime is 20975233. The reversal of 20975223 is 32257902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20975223 - 2² = 20975219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20975203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3495868 + ... + 3495873.

It is an arithmetic number, because the mean of its divisors is an integer number (6991742).

Almost surely, 2^20975223 is an apocalyptic number.

20975223 is a deficient number, since it is larger than the sum of its proper divisors (6991745).

20975223 is an equidigital number, since it uses as much as digits as its factorization.

20975223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6991744.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20975223 is about 4579.8715047477. The cubic root of 20975223 is about 275.7838703903.

The spelling of 20975223 in words is "twenty million, nine hundred seventy-five thousand, two hundred twenty-three".