20591344339 has 4 divisors (see below), whose sum is σ = 21070212856. Its totient is φ = 20112475824.

The previous prime is 20591344331. The next prime is 20591344349. The reversal of 20591344339 is 93344319502.

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 20591344339 - 2³ = 20591344331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 478868473 = 20591344339 / (2 + 0 + 5 + 9 + 1 + 3 + 4 + 4 + 3 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20591344295 and 20591344304.

It is not an unprimeable number, because it can be changed into a prime (20591344331) 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, 239434194 + ... + 239434279.

It is an arithmetic number, because the mean of its divisors is an integer number (5267553214).

Almost surely, 2^20591344339 is an apocalyptic number.

20591344339 is a deficient number, since it is larger than the sum of its proper divisors (478868517).

20591344339 is an equidigital number, since it uses as much as digits as its factorization.

20591344339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478868516.

The product of its (nonzero) digits is 349920, while the sum is 43.

The spelling of 20591344339 in words is "twenty billion, five hundred ninety-one million, three hundred forty-four thousand, three hundred thirty-nine".