20491039027 has 2 divisors, whose sum is σ = 20491039028. Its totient is φ = 20491039026.

The previous prime is 20491038989. The next prime is 20491039031. The reversal of 20491039027 is 72093019402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20491039027 - 2¹⁵ = 20491006259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20491039067) 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, 10245519513 + 10245519514.

It is an arithmetic number, because the mean of its divisors is an integer number (10245519514).

Almost surely, 2^20491039027 is an apocalyptic number.

20491039027 is a deficient number, since it is larger than the sum of its proper divisors (1).

20491039027 is an equidigital number, since it uses as much as digits as its factorization.

20491039027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 20491039027 in words is "twenty billion, four hundred ninety-one million, thirty-nine thousand, twenty-seven".