20113522505 has 4 divisors (see below), whose sum is σ = 24136227012. Its totient is φ = 16090818000.

The previous prime is 20113522463. The next prime is 20113522537. The reversal of 20113522505 is 50522531102.

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 13602323641 + 6511198864 = 116629^2 + 80692^2 .

It is not a de Polignac number, because 20113522505 - 2¹⁴ = 20113506121 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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011352246 + ... + 2011352255.

It is an arithmetic number, because the mean of its divisors is an integer number (6034056753).

Almost surely, 2^20113522505 is an apocalyptic number.

It is an amenable number.

20113522505 is a deficient number, since it is larger than the sum of its proper divisors (4022704507).

20113522505 is an equidigital number, since it uses as much as digits as its factorization.

20113522505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022704506.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20113522505 in words is "twenty billion, one hundred thirteen million, five hundred twenty-two thousand, five hundred five".