20840675759 has 4 divisors (see below), whose sum is σ = 21403937304. Its totient is φ = 20277414216.

The previous prime is 20840675731. The next prime is 20840675761. The reversal of 20840675759 is 95757604802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20840675759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20840675759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840675789) 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, 281630717 + ... + 281630790.

It is an arithmetic number, because the mean of its divisors is an integer number (5350984326).

Almost surely, 2^20840675759 is an apocalyptic number.

20840675759 is a deficient number, since it is larger than the sum of its proper divisors (563261545).

20840675759 is an equidigital number, since it uses as much as digits as its factorization.

20840675759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563261544.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 20840675759 in words is "twenty billion, eight hundred forty million, six hundred seventy-five thousand, seven hundred fifty-nine".