20887142079 has 4 divisors (see below), whose sum is σ = 27849522776. Its totient is φ = 13924761384.

The previous prime is 20887142047. The next prime is 20887142083. The reversal of 20887142079 is 97024178802.

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

It is not a de Polignac number, because 20887142079 - 2⁵ = 20887142047 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 (20887142179) 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, 3481190344 + ... + 3481190349.

It is an arithmetic number, because the mean of its divisors is an integer number (6962380694).

Almost surely, 2^20887142079 is an apocalyptic number.

20887142079 is a deficient number, since it is larger than the sum of its proper divisors (6962380697).

20887142079 is an equidigital number, since it uses as much as digits as its factorization.

20887142079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962380696.

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 20887142079 in words is "twenty billion, eight hundred eighty-seven million, one hundred forty-two thousand, seventy-nine".