20520385005 has 16 divisors (see below), whose sum is σ = 32892652224. Its totient is φ = 10924193280.

The previous prime is 20520384953. The next prime is 20520385009. The reversal of 20520385005 is 50058302502.

It is not a de Polignac number, because 20520385005 - 2¹⁴ = 20520368621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520385009) 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 15 ways as a sum of consecutive naturals, for example, 1242276 + ... + 1258685.

It is an arithmetic number, because the mean of its divisors is an integer number (2055790764).

Almost surely, 2^20520385005 is an apocalyptic number.

It is an amenable number.

20520385005 is a deficient number, since it is larger than the sum of its proper divisors (12372267219).

20520385005 is a wasteful number, since it uses less digits than its factorization.

20520385005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501516.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 20520385005 its reverse (50058302502), we get a palindrome (70578687507).

The spelling of 20520385005 in words is "twenty billion, five hundred twenty million, three hundred eighty-five thousand, five".