20347923 has 4 divisors (see below), whose sum is σ = 27130568. Its totient is φ = 13565280.

The previous prime is 20347909. The next prime is 20347973. The reversal of 20347923 is 32974302.

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

It is not a de Polignac number, because 20347923 - 2⁴ = 20347907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20347973) 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 3 ways as a sum of consecutive naturals, for example, 3391318 + ... + 3391323.

It is an arithmetic number, because the mean of its divisors is an integer number (6782642).

Almost surely, 2^20347923 is an apocalyptic number.

20347923 is a deficient number, since it is larger than the sum of its proper divisors (6782645).

20347923 is an equidigital number, since it uses as much as digits as its factorization.

20347923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6782644.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 20347923 is about 4510.8672115237. The cubic root of 20347923 is about 273.0067354669.

The spelling of 20347923 in words is "twenty million, three hundred forty-seven thousand, nine hundred twenty-three".