51323420 has 12 divisors (see below), whose sum is σ = 107779224. Its totient is φ = 20529360.

The previous prime is 51323399. The next prime is 51323423. The reversal of 51323420 is 2432315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2566171 = 51323420 / (5 + 1 + 3 + 2 + 3 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 51323392 and 51323401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51323423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1283066 + ... + 1283105.

It is an arithmetic number, because the mean of its divisors is an integer number (8981602).

Almost surely, 2^51323420 is an apocalyptic number.

It is an amenable number.

51323420 is an abundant number, since it is smaller than the sum of its proper divisors (56455804).

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

51323420 is a wasteful number, since it uses less digits than its factorization.

51323420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566180 (or 2566178 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51323420 is about 7164.0365716543. The cubic root of 51323420 is about 371.6252343991.

Adding to 51323420 its reverse (2432315), we get a palindrome (53755735).

The spelling of 51323420 in words is "fifty-one million, three hundred twenty-three thousand, four hundred twenty".