520746021 has 12 divisors (see below), whose sum is σ = 762783840. Its totient is φ = 342273960.

The previous prime is 520746007. The next prime is 520746047. The reversal of 520746021 is 120647025.

520746021 is a `hidden beast` number, since 52 + 0 + 7 + 4 + 602 + 1 = 666.

It is not a de Polignac number, because 520746021 - 2⁷ = 520745893 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 (520746221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406831 + ... + 408108.

It is an arithmetic number, because the mean of its divisors is an integer number (63565320).

Almost surely, 2^520746021 is an apocalyptic number.

It is an amenable number.

520746021 is a deficient number, since it is larger than the sum of its proper divisors (242037819).

520746021 is a wasteful number, since it uses less digits than its factorization.

520746021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815016 (or 815013 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 520746021 is about 22819.8602318244. The cubic root of 520746021 is about 804.5295251223.

The spelling of 520746021 in words is "five hundred twenty million, seven hundred forty-six thousand, twenty-one".