20117648827 has 2 divisors, whose sum is σ = 20117648828. Its totient is φ = 20117648826.

The previous prime is 20117648779. The next prime is 20117648833. The reversal of 20117648827 is 72884671102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20117648827 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117648867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058824413 + 10058824414.

It is an arithmetic number, because the mean of its divisors is an integer number (10058824414).

Almost surely, 2^20117648827 is an apocalyptic number.

20117648827 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117648827 is an equidigital number, since it uses as much as digits as its factorization.

20117648827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 20117648827 in words is "twenty billion, one hundred seventeen million, six hundred forty-eight thousand, eight hundred twenty-seven".