20513400113 has 4 divisors (see below), whose sum is σ = 20794405668. Its totient is φ = 20232394560.

The previous prime is 20513400109. The next prime is 20513400119. The reversal of 20513400113 is 31100431502.

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 15314557504 + 5198842609 = 123752^2 + 72103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513400113 - 2² = 20513400109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513400119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140502668 + ... + 140502813.

It is an arithmetic number, because the mean of its divisors is an integer number (5198601417).

Almost surely, 2^20513400113 is an apocalyptic number.

It is an amenable number.

20513400113 is a deficient number, since it is larger than the sum of its proper divisors (281005555).

20513400113 is an equidigital number, since it uses as much as digits as its factorization.

20513400113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281005554.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 20513400113 its reverse (31100431502), we get a palindrome (51613831615).

The spelling of 20513400113 in words is "twenty billion, five hundred thirteen million, four hundred thousand, one hundred thirteen".