20453173717 has 4 divisors (see below), whose sum is σ = 20664031276. Its totient is φ = 20242316160.

The previous prime is 20453173691. The next prime is 20453173721. The reversal of 20453173717 is 71737135402.

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 8055242001 + 12397931716 = 89751^2 + 111346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20453173717 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 20453173717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453173757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105428634 + ... + 105428827.

It is an arithmetic number, because the mean of its divisors is an integer number (5166007819).

Almost surely, 2^20453173717 is an apocalyptic number.

It is an amenable number.

20453173717 is a deficient number, since it is larger than the sum of its proper divisors (210857559).

20453173717 is an equidigital number, since it uses as much as digits as its factorization.

20453173717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210857558.

The product of its (nonzero) digits is 123480, while the sum is 40.

The spelling of 20453173717 in words is "twenty billion, four hundred fifty-three million, one hundred seventy-three thousand, seven hundred seventeen".