20513512350137 has 16 divisors (see below), whose sum is σ = 20764041722112. Its totient is φ = 20264006468160.

The previous prime is 20513512350113. The next prime is 20513512350203. The reversal of 20513512350137 is 73105321531502.

It is a cyclic number.

It is not a de Polignac number, because 20513512350137 - 2²⁶ = 20513445241273 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 20513512350137.

It is not an unprimeable number, because it can be changed into a prime (20513512353137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119347463 + ... + 119519219.

It is an arithmetic number, because the mean of its divisors is an integer number (1297752607632).

Almost surely, 2^{20513512350137} is an apocalyptic number.

It is an amenable number.

20513512350137 is a deficient number, since it is larger than the sum of its proper divisors (250529371975).

20513512350137 is a wasteful number, since it uses less digits than its factorization.

20513512350137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174728.

The product of its (nonzero) digits is 94500, while the sum is 38.

Adding to 20513512350137 its reverse (73105321531502), we get a palindrome (93618833881639).

The spelling of 20513512350137 in words is "twenty trillion, five hundred thirteen billion, five hundred twelve million, three hundred fifty thousand, one hundred thirty-seven".