520605 has 24 divisors (see below), whose sum is σ = 943488. Its totient is φ = 265056.

The previous prime is 520589. The next prime is 520607. The reversal of 520605 is 506025.

It is not a de Polignac number, because 520605 - 2⁴ = 520589 is a prime.

520605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784 + ... + 1286.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2⁵²⁰⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

520605 is a deficient number, since it is larger than the sum of its proper divisors (422883).

520605 is a wasteful number, since it uses less digits than its factorization.

520605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 520605 is about 721.5296251714. The cubic root of 520605 is about 80.4456894834.

The spelling of 520605 in words is "five hundred twenty thousand, six hundred five".