51112020 has 48 divisors (see below), whose sum is σ = 143998848. Its totient is φ = 13545600.

The previous prime is 51111989. The next prime is 51112043. The reversal of 51112020 is 2021115.

It is a super-2 number, since 2×51112020² = 5224877176960800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 51111987 and 51112005.

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, 7470 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (2999976).

Almost surely, 2^51112020 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 51112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71999424).

51112020 is an abundant number, since it is smaller than the sum of its proper divisors (92886828).

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

51112020 is a wasteful number, since it uses less digits than its factorization.

51112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280 (or 5278 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 51112020 is about 7149.2670953042. The cubic root of 51112020 is about 371.1142936077.

Adding to 51112020 its reverse (2021115), we get a palindrome (53133135).

The spelling of 51112020 in words is "fifty-one million, one hundred twelve thousand, twenty".