51385020 has 24 divisors (see below), whose sum is σ = 143878224. Its totient is φ = 13702656.

The previous prime is 51384989. The next prime is 51385021. The reversal of 51385020 is 2058315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51385021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428149 + ... + 428268.

It is an arithmetic number, because the mean of its divisors is an integer number (5994926).

Almost surely, 2^51385020 is an apocalyptic number.

It is an amenable number.

51385020 is an abundant number, since it is smaller than the sum of its proper divisors (92493204).

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

51385020 is a wasteful number, since it uses less digits than its factorization.

51385020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856429 (or 856427 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51385020 is about 7168.3345346043. The cubic root of 51385020 is about 371.7738537619.

The spelling of 51385020 in words is "fifty-one million, three hundred eighty-five thousand, twenty".