20523153113 has 4 divisors (see below), whose sum is σ = 20859598308. Its totient is φ = 20186707920.

The previous prime is 20523153103. The next prime is 20523153187. The reversal of 20523153113 is 31135132502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31135132502 = 2 ⋅15567566251.

It can be written as a sum of positive squares in 2 ways, for example, as 4720651849 + 15802501264 = 68707^2 + 125708^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523153113 - 2⁸ = 20523152857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523153103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168222506 + ... + 168222627.

It is an arithmetic number, because the mean of its divisors is an integer number (5214899577).

Almost surely, 2^20523153113 is an apocalyptic number.

It is an amenable number.

20523153113 is a deficient number, since it is larger than the sum of its proper divisors (336445195).

20523153113 is an equidigital number, since it uses as much as digits as its factorization.

20523153113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336445194.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 20523153113 its reverse (31135132502), we get a palindrome (51658285615).

The spelling of 20523153113 in words is "twenty billion, five hundred twenty-three million, one hundred fifty-three thousand, one hundred thirteen".