20684023 has 4 divisors (see below), whose sum is σ = 20695840. Its totient is φ = 20672208.

The previous prime is 20684021. The next prime is 20684029. The reversal of 20684023 is 32048602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32048602 = 2 ⋅16024301.

It is a cyclic number.

It is not a de Polignac number, because 20684023 - 2¹ = 20684021 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 (20684021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2703 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (5173960).

Almost surely, 2^20684023 is an apocalyptic number.

20684023 is a deficient number, since it is larger than the sum of its proper divisors (11817).

20684023 is an equidigital number, since it uses as much as digits as its factorization.

20684023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11816.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20684023 is about 4547.9691071950. The cubic root of 20684023 is about 274.5016782633.

The spelling of 20684023 in words is "twenty million, six hundred eighty-four thousand, twenty-three".