20013133711537 has 4 divisors (see below), whose sum is σ = 21066456538480. Its totient is φ = 18959810884596.

The previous prime is 20013133711531. The next prime is 20013133711541. The reversal of 20013133711537 is 73511733131002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013133711537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013133711496 and 20013133711505.

It is not an unprimeable number, because it can be changed into a prime (20013133711531) 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, 526661413443 + ... + 526661413480.

It is an arithmetic number, because the mean of its divisors is an integer number (5266614134620).

Almost surely, 2^{20013133711537} is an apocalyptic number.

It is an amenable number.

20013133711537 is a deficient number, since it is larger than the sum of its proper divisors (1053322826943).

20013133711537 is a wasteful number, since it uses less digits than its factorization.

20013133711537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053322826942.

The product of its (nonzero) digits is 39690, while the sum is 37.

Adding to 20013133711537 its reverse (73511733131002), we get a palindrome (93524866842539).

The spelling of 20013133711537 in words is "twenty trillion, thirteen billion, one hundred thirty-three million, seven hundred eleven thousand, five hundred thirty-seven".