20520544113 has 12 divisors (see below), whose sum is σ = 29642328820. Its totient is φ = 13679650656.

The previous prime is 20520544111. The next prime is 20520544129. The reversal of 20520544113 is 31144502502.

20520544113 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 0 + 544 + 113 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17605839969 + 2914704144 = 132687^2 + 53988^2 .

It is not a de Polignac number, because 20520544113 - 2¹ = 20520544111 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20520544111) 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 11 ways as a sum of consecutive naturals, for example, 169695 + ... + 264267.

Almost surely, 2^20520544113 is an apocalyptic number.

It is an amenable number.

20520544113 is a deficient number, since it is larger than the sum of its proper divisors (9121784707).

20520544113 is a wasteful number, since it uses less digits than its factorization.

20520544113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118688 (or 118685 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 20520544113 in words is "twenty billion, five hundred twenty million, five hundred forty-four thousand, one hundred thirteen".