20135513 has 2 divisors, whose sum is σ = 20135514. Its totient is φ = 20135512.

The previous prime is 20135509. The next prime is 20135537. The reversal of 20135513 is 31553102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13520329 + 6615184 = 3677^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20135513 - 2² = 20135509 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20135113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10067756 + 10067757.

It is an arithmetic number, because the mean of its divisors is an integer number (10067757).

Almost surely, 2^20135513 is an apocalyptic number.

It is an amenable number.

20135513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20135513 is an equidigital number, since it uses as much as digits as its factorization.

20135513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 20135513 is about 4487.2611914173. The cubic root of 20135513 is about 272.0534470015.

Adding to 20135513 its reverse (31553102), we get a palindrome (51688615).

The spelling of 20135513 in words is "twenty million, one hundred thirty-five thousand, five hundred thirteen".