20525213113 has 4 divisors (see below), whose sum is σ = 20580240868. Its totient is φ = 20470185360.

The previous prime is 20525213099. The next prime is 20525213131. The reversal of 20525213113 is 31131252502.

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 4004738089 + 16520475024 = 63283^2 + 128532^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525213113 - 2⁹ = 20525212601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525210113) 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, 27513318 + ... + 27514063.

It is an arithmetic number, because the mean of its divisors is an integer number (5145060217).

Almost surely, 2^20525213113 is an apocalyptic number.

It is an amenable number.

20525213113 is a deficient number, since it is larger than the sum of its proper divisors (55027755).

20525213113 is an equidigital number, since it uses as much as digits as its factorization.

20525213113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55027754.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20525213113 its reverse (31131252502), we get a palindrome (51656465615).

The spelling of 20525213113 in words is "twenty billion, five hundred twenty-five million, two hundred thirteen thousand, one hundred thirteen".