51565020 has 48 divisors (see below), whose sum is σ = 155490720. Its totient is φ = 12692736.

The previous prime is 51565001. The next prime is 51565043. The reversal of 51565020 is 2056515.

51565020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32275 + ... + 33834.

It is an arithmetic number, because the mean of its divisors is an integer number (3239390).

Almost surely, 2^51565020 is an apocalyptic number.

It is an amenable number.

51565020 is an abundant number, since it is smaller than the sum of its proper divisors (103925700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51565020 is a wasteful number, since it uses less digits than its factorization.

51565020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66134 (or 66132 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 51565020 is about 7180.8787763059. The cubic root of 51565020 is about 372.2074516387.

The spelling of 51565020 in words is "fifty-one million, five hundred sixty-five thousand, twenty".