20023021439 has 2 divisors, whose sum is σ = 20023021440. Its totient is φ = 20023021438.

The previous prime is 20023021429. The next prime is 20023021471. The reversal of 20023021439 is 93412032002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023021439 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023021429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011510719 + 10011510720.

It is an arithmetic number, because the mean of its divisors is an integer number (10011510720).

Almost surely, 2^20023021439 is an apocalyptic number.

20023021439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023021439 is an equidigital number, since it uses as much as digits as its factorization.

20023021439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 20023021439 in words is "twenty billion, twenty-three million, twenty-one thousand, four hundred thirty-nine".