20665734223 has 4 divisors (see below), whose sum is σ = 20668536928. Its totient is φ = 20662931520.

The previous prime is 20665734113. The next prime is 20665734239. The reversal of 20665734223 is 32243756602.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20665734223 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 (20665734923) 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, 1390263 + ... + 1405048.

It is an arithmetic number, because the mean of its divisors is an integer number (5167134232).

Almost surely, 2^20665734223 is an apocalyptic number.

20665734223 is a deficient number, since it is larger than the sum of its proper divisors (2802705).

20665734223 is an equidigital number, since it uses as much as digits as its factorization.

20665734223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802704.

The product of its (nonzero) digits is 362880, while the sum is 40.

The spelling of 20665734223 in words is "twenty billion, six hundred sixty-five million, seven hundred thirty-four thousand, two hundred twenty-three".