20688635927 has 2 divisors, whose sum is σ = 20688635928. Its totient is φ = 20688635926.

The previous prime is 20688635897. The next prime is 20688635939. The reversal of 20688635927 is 72953688602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20688635927 - 2¹⁰ = 20688634903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20688635327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344317963 + 10344317964.

It is an arithmetic number, because the mean of its divisors is an integer number (10344317964).

Almost surely, 2^20688635927 is an apocalyptic number.

20688635927 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688635927 is an equidigital number, since it uses as much as digits as its factorization.

20688635927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 20688635927 in words is "twenty billion, six hundred eighty-eight million, six hundred thirty-five thousand, nine hundred twenty-seven".