20523113105 has 12 divisors (see below), whose sum is σ = 27070156596. Its totient is φ = 14925900000.

The previous prime is 20523113087. The next prime is 20523113113. The reversal of 20523113105 is 50131132502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8064758416 + 12458354689 = 89804^2 + 111617^2 .

It is not a de Polignac number, because 20523113105 - 2⁸ = 20523112849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16960646 + ... + 16961855.

It is an arithmetic number, because the mean of its divisors is an integer number (2255846383).

Almost surely, 2^20523113105 is an apocalyptic number.

It is an amenable number.

20523113105 is a deficient number, since it is larger than the sum of its proper divisors (6547043491).

20523113105 is a wasteful number, since it uses less digits than its factorization.

20523113105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33922528 (or 33922517 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 20523113105 its reverse (50131132502), we get a palindrome (70654245607).

The spelling of 20523113105 in words is "twenty billion, five hundred twenty-three million, one hundred thirteen thousand, one hundred five".