20839440773 has 4 divisors (see below), whose sum is σ = 21402668940. Its totient is φ = 20276212608.

The previous prime is 20839440767. The next prime is 20839440793. The reversal of 20839440773 is 37704493802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11534330404 + 9305110369 = 107398^2 + 96463^2 .

It is a cyclic number.

It is not a de Polignac number, because 20839440773 - 2²⁴ = 20822663557 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 (20839440733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281614028 + ... + 281614101.

It is an arithmetic number, because the mean of its divisors is an integer number (5350667235).

Almost surely, 2^20839440773 is an apocalyptic number.

It is an amenable number.

20839440773 is a deficient number, since it is larger than the sum of its proper divisors (563228167).

20839440773 is an equidigital number, since it uses as much as digits as its factorization.

20839440773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563228166.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 20839440773 in words is "twenty billion, eight hundred thirty-nine million, four hundred forty thousand, seven hundred seventy-three".