20542442087 has 2 divisors, whose sum is σ = 20542442088. Its totient is φ = 20542442086.

The previous prime is 20542442003. The next prime is 20542442119. The reversal of 20542442087 is 78024424502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20542442087 - 2¹⁰ = 20542441063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20542442087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542412087) 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, 10271221043 + 10271221044.

It is an arithmetic number, because the mean of its divisors is an integer number (10271221044).

Almost surely, 2^20542442087 is an apocalyptic number.

20542442087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542442087 is an equidigital number, since it uses as much as digits as its factorization.

20542442087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143360, while the sum is 38.

Adding to 20542442087 its reverse (78024424502), we get a palindrome (98566866589).

The spelling of 20542442087 in words is "twenty billion, five hundred forty-two million, four hundred forty-two thousand, eighty-seven".