20127686757 has 4 divisors (see below), whose sum is σ = 26836915680. Its totient is φ = 13418457836.

The previous prime is 20127686753. The next prime is 20127686759. The reversal of 20127686757 is 75768672102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20127686757 - 2² = 20127686753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127686753) 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, 3354614457 + ... + 3354614462.

It is an arithmetic number, because the mean of its divisors is an integer number (6709228920).

Almost surely, 2^20127686757 is an apocalyptic number.

It is an amenable number.

20127686757 is a deficient number, since it is larger than the sum of its proper divisors (6709228923).

20127686757 is an equidigital number, since it uses as much as digits as its factorization.

20127686757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6709228922.

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 20127686757 in words is "twenty billion, one hundred twenty-seven million, six hundred eighty-six thousand, seven hundred fifty-seven".