20523240113 has 2 divisors, whose sum is σ = 20523240114. Its totient is φ = 20523240112.

The previous prime is 20523240109. The next prime is 20523240119. The reversal of 20523240113 is 31104232502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19391119504 + 1132120609 = 139252^2 + 33647^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523240113 - 2² = 20523240109 is a prime.

It is a super-3 number, since 3×20523240113³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20523240119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261620056 + 10261620057.

It is an arithmetic number, because the mean of its divisors is an integer number (10261620057).

Almost surely, 2^20523240113 is an apocalyptic number.

It is an amenable number.

20523240113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523240113 is an equidigital number, since it uses as much as digits as its factorization.

20523240113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20523240113 its reverse (31104232502), we get a palindrome (51627472615).

The spelling of 20523240113 in words is "twenty billion, five hundred twenty-three million, two hundred forty thousand, one hundred thirteen".