20695118987 has 4 divisors (see below), whose sum is σ = 20695562736. Its totient is φ = 20694675240.

The previous prime is 20695118933. The next prime is 20695118999. The reversal of 20695118987 is 78981159602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20695118987 - 2²⁸ = 20426683531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20695118287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142439 + ... + 248352.

It is an arithmetic number, because the mean of its divisors is an integer number (5173890684).

Almost surely, 2^20695118987 is an apocalyptic number.

20695118987 is a deficient number, since it is larger than the sum of its proper divisors (443749).

20695118987 is an equidigital number, since it uses as much as digits as its factorization.

20695118987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443748.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 20695118987 in words is "twenty billion, six hundred ninety-five million, one hundred eighteen thousand, nine hundred eighty-seven".