51632020 has 48 divisors (see below), whose sum is σ = 121500288. Its totient is φ = 18264960.

The previous prime is 51631961. The next prime is 51632039. The reversal of 51632020 is 2023615.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4969 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (2531256).

Almost surely, 2^51632020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51632020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60750144).

51632020 is an abundant number, since it is smaller than the sum of its proper divisors (69868268).

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

51632020 is a wasteful number, since it uses less digits than its factorization.

51632020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6400 (or 6398 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51632020 is about 7185.5424290724. The cubic root of 51632020 is about 372.3685886924.

Adding to 51632020 its reverse (2023615), we get a palindrome (53655635).

The spelling of 51632020 in words is "fifty-one million, six hundred thirty-two thousand, twenty".