20507370773 has 4 divisors (see below), whose sum is σ = 20508136428. Its totient is φ = 20506605120.

The previous prime is 20507370749. The next prime is 20507370809. The reversal of 20507370773 is 37707370502.

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 1644545809 + 18862824964 = 40553^2 + 137342^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507370773 - 2⁸ = 20507370517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20507370773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20507370713) 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, 341138 + ... + 396723.

It is an arithmetic number, because the mean of its divisors is an integer number (5127034107).

Almost surely, 2^20507370773 is an apocalyptic number.

It is an amenable number.

20507370773 is a deficient number, since it is larger than the sum of its proper divisors (765655).

20507370773 is an equidigital number, since it uses as much as digits as its factorization.

20507370773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765654.

The product of its (nonzero) digits is 216090, while the sum is 41.

The spelling of 20507370773 in words is "twenty billion, five hundred seven million, three hundred seventy thousand, seven hundred seventy-three".