20640050751 has 4 divisors (see below), whose sum is σ = 27520067672. Its totient is φ = 13760033832.

The previous prime is 20640050741. The next prime is 20640050789. The reversal of 20640050751 is 15705004602.

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

It is not a de Polignac number, because 20640050751 - 2⁹ = 20640050239 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 (20640050701) 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, 3440008456 + ... + 3440008461.

It is an arithmetic number, because the mean of its divisors is an integer number (6880016918).

Almost surely, 2^20640050751 is an apocalyptic number.

20640050751 is a deficient number, since it is larger than the sum of its proper divisors (6880016921).

20640050751 is an equidigital number, since it uses as much as digits as its factorization.

20640050751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880016920.

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 20640050751 in words is "twenty billion, six hundred forty million, fifty thousand, seven hundred fifty-one".