20538558847 has 2 divisors, whose sum is σ = 20538558848. Its totient is φ = 20538558846.

The previous prime is 20538558773. The next prime is 20538558851. The reversal of 20538558847 is 74885583502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20538558847 - 2²³ = 20530170239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538568847) 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, 10269279423 + 10269279424.

It is an arithmetic number, because the mean of its divisors is an integer number (10269279424).

Almost surely, 2^20538558847 is an apocalyptic number.

20538558847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538558847 is an equidigital number, since it uses as much as digits as its factorization.

20538558847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752000, while the sum is 55.

The spelling of 20538558847 in words is "twenty billion, five hundred thirty-eight million, five hundred fifty-eight thousand, eight hundred forty-seven".