51806020 has 48 divisors (see below), whose sum is σ = 124750080. Its totient is φ = 17702784.

The previous prime is 51806011. The next prime is 51806023. The reversal of 51806020 is 2060815.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51805982 and 51806000.

It is not an unprimeable number, because it can be changed into a prime (51806023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70897 + ... + 71623.

It is an arithmetic number, because the mean of its divisors is an integer number (2598960).

Almost surely, 2^51806020 is an apocalyptic number.

It is an amenable number.

51806020 is an abundant number, since it is smaller than the sum of its proper divisors (72944060).

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

51806020 is a wasteful number, since it uses less digits than its factorization.

51806020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51806020 is about 7197.6398909643. The cubic root of 51806020 is about 372.7864139566.

Adding to 51806020 its reverse (2060815), we get a palindrome (53866835).

The spelling of 51806020 in words is "fifty-one million, eight hundred six thousand, twenty".