20115685087 has 2 divisors, whose sum is σ = 20115685088. Its totient is φ = 20115685086.

The previous prime is 20115685063. The next prime is 20115685127. The reversal of 20115685087 is 78058651102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20115685087 - 2¹¹ = 20115683039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20115685487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057842543 + 10057842544.

It is an arithmetic number, because the mean of its divisors is an integer number (10057842544).

Almost surely, 2^20115685087 is an apocalyptic number.

20115685087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115685087 is an equidigital number, since it uses as much as digits as its factorization.

20115685087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 20115685087 in words is "twenty billion, one hundred fifteen million, six hundred eighty-five thousand, eighty-seven".