20839679999 has 4 divisors (see below), whose sum is σ = 20874012864. Its totient is φ = 20805347136.

The previous prime is 20839679983. The next prime is 20839680031. The reversal of 20839679999 is 99997693802.

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 20839679999 - 2⁴ = 20839679983 is a prime.

It is a super-3 number, since 3×20839679999³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839679969) 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, 17165522 + ... + 17166735.

It is an arithmetic number, because the mean of its divisors is an integer number (5218503216).

Almost surely, 2^20839679999 is an apocalyptic number.

20839679999 is a deficient number, since it is larger than the sum of its proper divisors (34332865).

20839679999 is an equidigital number, since it uses as much as digits as its factorization.

20839679999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34332864.

The product of its (nonzero) digits is 119042784, while the sum is 71.

The spelling of 20839679999 in words is "twenty billion, eight hundred thirty-nine million, six hundred seventy-nine thousand, nine hundred ninety-nine".