20979228839 has 2 divisors, whose sum is σ = 20979228840. Its totient is φ = 20979228838.

The previous prime is 20979228833. The next prime is 20979228847. The reversal of 20979228839 is 93882297902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20979228839 - 2²⁰ = 20978180263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20979228833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489614419 + 10489614420.

It is an arithmetic number, because the mean of its divisors is an integer number (10489614420).

Almost surely, 2^20979228839 is an apocalyptic number.

20979228839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979228839 is an equidigital number, since it uses as much as digits as its factorization.

20979228839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 20979228839 in words is "twenty billion, nine hundred seventy-nine million, two hundred twenty-eight thousand, eight hundred thirty-nine".