20718987584927 has 4 divisors (see below), whose sum is σ = 20817181839096. Its totient is φ = 20620793330760.

The previous prime is 20718987584917. The next prime is 20718987584989. The reversal of 20718987584927 is 72948578981702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20718987584927 - 2⁸ = 20718987584671 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 (20718987584917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49097126768 + ... + 49097127189.

It is an arithmetic number, because the mean of its divisors is an integer number (5204295459774).

Almost surely, 2^{20718987584927} is an apocalyptic number.

20718987584927 is a deficient number, since it is larger than the sum of its proper divisors (98194254169).

20718987584927 is an equidigital number, since it uses as much as digits as its factorization.

20718987584927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98194254168.

The product of its (nonzero) digits is 1137991680, while the sum is 77.

The spelling of 20718987584927 in words is "twenty trillion, seven hundred eighteen billion, nine hundred eighty-seven million, five hundred eighty-four thousand, nine hundred twenty-seven".