20520444523 has 4 divisors (see below), whose sum is σ = 20553703560. Its totient is φ = 20487185488.

The previous prime is 20520444431. The next prime is 20520444569. The reversal of 20520444523 is 32544402502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20520444523 - 2¹³ = 20520436331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520444583) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16628593 + ... + 16629826.

It is an arithmetic number, because the mean of its divisors is an integer number (5138425890).

Almost surely, 2^20520444523 is an apocalyptic number.

20520444523 is a deficient number, since it is larger than the sum of its proper divisors (33259037).

20520444523 is an equidigital number, since it uses as much as digits as its factorization.

20520444523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33259036.

The product of its (nonzero) digits is 38400, while the sum is 31.

The spelling of 20520444523 in words is "twenty billion, five hundred twenty million, four hundred forty-four thousand, five hundred twenty-three".