20023139 has 2 divisors, whose sum is σ = 20023140. Its totient is φ = 20023138.

The previous prime is 20023121. The next prime is 20023141. The reversal of 20023139 is 93132002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023139 is a prime.

Together with 20023141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20023139.

It is not a weakly prime, because it can be changed into another prime (20023039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011569 + 10011570.

It is an arithmetic number, because the mean of its divisors is an integer number (10011570).

Almost surely, 2^20023139 is an apocalyptic number.

20023139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023139 is an equidigital number, since it uses as much as digits as its factorization.

20023139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20023139 is about 4474.7222260158. The cubic root of 20023139 is about 271.5464028304.

The spelling of 20023139 in words is "twenty million, twenty-three thousand, one hundred thirty-nine".