20822879839 has 4 divisors (see below), whose sum is σ = 20912248656. Its totient is φ = 20733511024.

The previous prime is 20822879821. The next prime is 20822879843. The reversal of 20822879839 is 93897822802.

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 20822879839 - 2⁹ = 20822879327 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20822879939) 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, 44684059 + ... + 44684524.

It is an arithmetic number, because the mean of its divisors is an integer number (5228062164).

Almost surely, 2^20822879839 is an apocalyptic number.

20822879839 is a deficient number, since it is larger than the sum of its proper divisors (89368817).

20822879839 is an equidigital number, since it uses as much as digits as its factorization.

20822879839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89368816.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 20822879839 in words is "twenty billion, eight hundred twenty-two million, eight hundred seventy-nine thousand, eight hundred thirty-nine".