520023687 has 4 divisors (see below), whose sum is σ = 693364920. Its totient is φ = 346682456.

The previous prime is 520023671. The next prime is 520023697. The reversal of 520023687 is 786320025.

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 520023687 - 2⁴ = 520023671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520023697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86670612 + ... + 86670617.

It is an arithmetic number, because the mean of its divisors is an integer number (173341230).

Almost surely, 2^520023687 is an apocalyptic number.

520023687 is a deficient number, since it is larger than the sum of its proper divisors (173341233).

520023687 is a wasteful number, since it uses less digits than its factorization.

520023687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173341232.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 520023687 is about 22804.0278679009. The cubic root of 520023687 is about 804.1573616518.

It can be divided in two parts, 520023 and 687, that added together give a triangular number (520710 = T₁₀₂₀).

The spelling of 520023687 in words is "five hundred twenty million, twenty-three thousand, six hundred eighty-seven".