20320145513 has 4 divisors (see below), whose sum is σ = 20346433668. Its totient is φ = 20293857360.

The previous prime is 20320145497. The next prime is 20320145533. The reversal of 20320145513 is 31554102302.

It is a happy number.

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 5878595584 + 14441549929 = 76672^2 + 120173^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320145513 - 2⁴ = 20320145497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320145533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13142918 + ... + 13144463.

It is an arithmetic number, because the mean of its divisors is an integer number (5086608417).

Almost surely, 2^20320145513 is an apocalyptic number.

It is an amenable number.

20320145513 is a deficient number, since it is larger than the sum of its proper divisors (26288155).

20320145513 is an equidigital number, since it uses as much as digits as its factorization.

20320145513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26288154.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20320145513 its reverse (31554102302), we get a palindrome (51874247815).

The spelling of 20320145513 in words is "twenty billion, three hundred twenty million, one hundred forty-five thousand, five hundred thirteen".