20593499987 has 2 divisors, whose sum is σ = 20593499988. Its totient is φ = 20593499986.

The previous prime is 20593499911. The next prime is 20593499989. The reversal of 20593499987 is 78999439502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20593499987 - 2¹² = 20593495891 is a prime.

Together with 20593499989, 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 (20593499989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10296749993 + 10296749994.

It is an arithmetic number, because the mean of its divisors is an integer number (10296749994).

Almost surely, 2^20593499987 is an apocalyptic number.

20593499987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20593499987 is an equidigital number, since it uses as much as digits as its factorization.

20593499987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44089920, while the sum is 65.

The spelling of 20593499987 in words is "twenty billion, five hundred ninety-three million, four hundred ninety-nine thousand, nine hundred eighty-seven".