51345020 has 24 divisors (see below), whose sum is σ = 108836784. Its totient is φ = 20345216.

The previous prime is 51345017. The next prime is 51345031. The reversal of 51345020 is 2054315.

It is a super-2 number, since 2×51345020² = 5272622157600800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51344983 and 51345001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9857 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (4534866).

Almost surely, 2^51345020 is an apocalyptic number.

It is an amenable number.

51345020 is an abundant number, since it is smaller than the sum of its proper divisors (57491764).

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

51345020 is a wasteful number, since it uses less digits than its factorization.

51345020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24109 (or 24107 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51345020 is about 7165.5439430653. The cubic root of 51345020 is about 371.6773612139.

Adding to 51345020 its reverse (2054315), we get a palindrome (53399335).

The spelling of 51345020 in words is "fifty-one million, three hundred forty-five thousand, twenty".