20617049867 has 2 divisors, whose sum is σ = 20617049868. Its totient is φ = 20617049866.

The previous prime is 20617049861. The next prime is 20617049909. The reversal of 20617049867 is 76894071602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20617049867 - 2¹⁴ = 20617033483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20617049861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308524933 + 10308524934.

It is an arithmetic number, because the mean of its divisors is an integer number (10308524934).

Almost surely, 2^20617049867 is an apocalyptic number.

20617049867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20617049867 is an equidigital number, since it uses as much as digits as its factorization.

20617049867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 20617049867 in words is "twenty billion, six hundred seventeen million, forty-nine thousand, eight hundred sixty-seven".