20868422087 has 4 divisors (see below), whose sum is σ = 21018554760. Its totient is φ = 20718289416.

The previous prime is 20868422053. The next prime is 20868422093. The reversal of 20868422087 is 78022486802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20868422087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868472087) 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, 75066128 + ... + 75066405.

It is an arithmetic number, because the mean of its divisors is an integer number (5254638690).

Almost surely, 2^20868422087 is an apocalyptic number.

20868422087 is a deficient number, since it is larger than the sum of its proper divisors (150132673).

20868422087 is a wasteful number, since it uses less digits than its factorization.

20868422087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150132672.

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 20868422087 in words is "twenty billion, eight hundred sixty-eight million, four hundred twenty-two thousand, eighty-seven".