20669323 has 4 divisors (see below), whose sum is σ = 20931040. Its totient is φ = 20407608.

The previous prime is 20669317. The next prime is 20669339. The reversal of 20669323 is 32396602.

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 20669323 - 2⁵ = 20669291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20669303) 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, 130740 + ... + 130897.

It is an arithmetic number, because the mean of its divisors is an integer number (5232760).

Almost surely, 2^20669323 is an apocalyptic number.

20669323 is a deficient number, since it is larger than the sum of its proper divisors (261717).

20669323 is an equidigital number, since it uses as much as digits as its factorization.

20669323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261716.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 20669323 is about 4546.3527139895. The cubic root of 20669323 is about 274.4366340023.

The spelling of 20669323 in words is "twenty million, six hundred sixty-nine thousand, three hundred twenty-three".