20003513165729 has 4 divisors (see below), whose sum is σ = 20004183711876. Its totient is φ = 20002842619584.

The previous prime is 20003513165717. The next prime is 20003513165773. The reversal of 20003513165729 is 92756131530002.

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 12106064308129 + 7897448857600 = 3479377^2 + 2810240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003513165729 - 2⁸ = 20003513165473 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 20003513165729.

It is not an unprimeable number, because it can be changed into a prime (20003513161729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335228324 + ... + 335287989.

It is an arithmetic number, because the mean of its divisors is an integer number (5001045927969).

Almost surely, 2^{20003513165729} is an apocalyptic number.

It is an amenable number.

20003513165729 is a deficient number, since it is larger than the sum of its proper divisors (670546147).

20003513165729 is an equidigital number, since it uses as much as digits as its factorization.

20003513165729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670546146.

The product of its (nonzero) digits is 340200, while the sum is 44.

The spelling of 20003513165729 in words is "twenty trillion, three billion, five hundred thirteen million, one hundred sixty-five thousand, seven hundred twenty-nine".