20416991027 has 2 divisors, whose sum is σ = 20416991028. Its totient is φ = 20416991026.

The previous prime is 20416990999. The next prime is 20416991029. The reversal of 20416991027 is 72019961402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20416991027 - 2⁸ = 20416990771 is a prime.

Together with 20416991029, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20416991029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208495513 + 10208495514.

It is an arithmetic number, because the mean of its divisors is an integer number (10208495514).

Almost surely, 2^20416991027 is an apocalyptic number.

20416991027 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416991027 is an equidigital number, since it uses as much as digits as its factorization.

20416991027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 20416991027 in words is "twenty billion, four hundred sixteen million, nine hundred ninety-one thousand, twenty-seven".