20013657311537 has 4 divisors (see below), whose sum is σ = 20013670490100. Its totient is φ = 20013644132976.

The previous prime is 20013657311533. The next prime is 20013657311567. The reversal of 20013657311537 is 73511375631002.

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 10239974400016 + 9773682911521 = 3199996^2 + 3126289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013657311537 - 2² = 20013657311533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013657311533) 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, 3962162 + ... + 7464987.

It is an arithmetic number, because the mean of its divisors is an integer number (5003417622525).

Almost surely, 2^{20013657311537} is an apocalyptic number.

It is an amenable number.

20013657311537 is a deficient number, since it is larger than the sum of its proper divisors (13178563).

20013657311537 is a wasteful number, since it uses less digits than its factorization.

20013657311537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13178562.

The product of its (nonzero) digits is 396900, while the sum is 44.

The spelling of 20013657311537 in words is "twenty trillion, thirteen billion, six hundred fifty-seven million, three hundred eleven thousand, five hundred thirty-seven".