20023256623 has 2 divisors, whose sum is σ = 20023256624. Its totient is φ = 20023256622.

The previous prime is 20023256599. The next prime is 20023256789. The reversal of 20023256623 is 32665232002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023256623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021256623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011628311 + 10011628312.

It is an arithmetic number, because the mean of its divisors is an integer number (10011628312).

Almost surely, 2^20023256623 is an apocalyptic number.

20023256623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023256623 is an equidigital number, since it uses as much as digits as its factorization.

20023256623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 20023256623 its reverse (32665232002), we get a palindrome (52688488625).

The spelling of 20023256623 in words is "twenty billion, twenty-three million, two hundred fifty-six thousand, six hundred twenty-three".