51243020 has 24 divisors (see below), whose sum is σ = 107748144. Its totient is φ = 20470976.

The previous prime is 51243013. The next prime is 51243041. The reversal of 51243020 is 2034215.

It is a self number, because there is not a number n which added to its sum of digits gives 51243020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24662 + ... + 26658.

It is an arithmetic number, because the mean of its divisors is an integer number (4489506).

Almost surely, 2^51243020 is an apocalyptic number.

It is an amenable number.

51243020 is an abundant number, since it is smaller than the sum of its proper divisors (56505124).

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

51243020 is a wasteful number, since it uses less digits than its factorization.

51243020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 51243020 is about 7158.4230106917. The cubic root of 51243020 is about 371.4310781741.

Adding to 51243020 its reverse (2034215), we get a palindrome (53277235).

The spelling of 51243020 in words is "fifty-one million, two hundred forty-three thousand, twenty".