20013123656087 has 2 divisors, whose sum is σ = 20013123656088. Its totient is φ = 20013123656086.

The previous prime is 20013123656081. The next prime is 20013123656159. The reversal of 20013123656087 is 78065632131002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20013123656087 - 2⁶ = 20013123656023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013123656081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006561828043 + 10006561828044.

It is an arithmetic number, because the mean of its divisors is an integer number (10006561828044).

Almost surely, 2^{20013123656087} is an apocalyptic number.

20013123656087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013123656087 is an equidigital number, since it uses as much as digits as its factorization.

20013123656087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

Adding to 20013123656087 its reverse (78065632131002), we get a palindrome (98078755787089).

The spelling of 20013123656087 in words is "twenty trillion, thirteen billion, one hundred twenty-three million, six hundred fifty-six thousand, eighty-seven".