20445746713 has 20 divisors (see below), whose sum is σ = 24496705700. Its totient is φ = 17051205024.

The previous prime is 20445746693. The next prime is 20445746723. The reversal of 20445746713 is 31764754402.

It can be written as a sum of positive squares in 2 ways, for example, as 17142141184 + 3303605529 = 130928^2 + 57477^2 .

It is not a de Polignac number, because 20445746713 - 2²⁹ = 19908875801 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 20445746713.

It is not an unprimeable number, because it can be changed into a prime (20445746723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26238 + ... + 203911.

It is an arithmetic number, because the mean of its divisors is an integer number (1224835285).

Almost surely, 2^20445746713 is an apocalyptic number.

It is an amenable number.

20445746713 is a deficient number, since it is larger than the sum of its proper divisors (4050958987).

20445746713 is an frugal number, since it uses more digits than its factorization.

20445746713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230214 (or 230193 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 43.

The spelling of 20445746713 in words is "twenty billion, four hundred forty-five million, seven hundred forty-six thousand, seven hundred thirteen".