20178807487 has 2 divisors, whose sum is σ = 20178807488. Its totient is φ = 20178807486.

The previous prime is 20178807469. The next prime is 20178807553. The reversal of 20178807487 is 78470887102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20178807487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20178807457) 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, 10089403743 + 10089403744.

It is an arithmetic number, because the mean of its divisors is an integer number (10089403744).

Almost surely, 2^20178807487 is an apocalyptic number.

20178807487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20178807487 is an equidigital number, since it uses as much as digits as its factorization.

20178807487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1404928, while the sum is 52.

The spelling of 20178807487 in words is "twenty billion, one hundred seventy-eight million, eight hundred seven thousand, four hundred eighty-seven".