20664050087 has 2 divisors, whose sum is σ = 20664050088. Its totient is φ = 20664050086.

The previous prime is 20664050063. The next prime is 20664050107. The reversal of 20664050087 is 78005046602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20664050087 - 2¹⁸ = 20663787943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20664050087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20664050047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332025043 + 10332025044.

It is an arithmetic number, because the mean of its divisors is an integer number (10332025044).

Almost surely, 2^20664050087 is an apocalyptic number.

20664050087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20664050087 is an equidigital number, since it uses as much as digits as its factorization.

20664050087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 20664050087 its reverse (78005046602), we get a palindrome (98669096689).

The spelling of 20664050087 in words is "twenty billion, six hundred sixty-four million, fifty thousand, eighty-seven".