51369820 has 24 divisors (see below), whose sum is σ = 108055584. Its totient is φ = 20513856.

The previous prime is 51369797. The next prime is 51369823. The reversal of 51369820 is 2896315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51369823) 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, 12774 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (4502316).

Almost surely, 2^51369820 is an apocalyptic number.

It is an amenable number.

51369820 is an abundant number, since it is smaller than the sum of its proper divisors (56685764).

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

51369820 is a wasteful number, since it uses less digits than its factorization.

51369820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269 (or 4267 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 51369820 is about 7167.2742378117. The cubic root of 51369820 is about 371.7371924946.

The spelling of 51369820 in words is "fifty-one million, three hundred sixty-nine thousand, eight hundred twenty".