51168020 has 24 divisors (see below), whose sum is σ = 109216968. Its totient is φ = 20131200.

The previous prime is 51168017. The next prime is 51168023. The reversal of 51168020 is 2086115.

It is an interprime number because it is at equal distance from previous prime (51168017) and next prime (51168023).

It can be written as a sum of positive squares in 4 ways, for example, as 4682896 + 46485124 = 2164^2 + 6818^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51168023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19751 + ... + 22190.

It is an arithmetic number, because the mean of its divisors is an integer number (4550707).

Almost surely, 2^51168020 is an apocalyptic number.

It is an amenable number.

51168020 is an abundant number, since it is smaller than the sum of its proper divisors (58048948).

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

51168020 is a wasteful number, since it uses less digits than its factorization.

51168020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42011 (or 42009 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 51168020 is about 7153.1825085063. The cubic root of 51168020 is about 371.2497791229.

The spelling of 51168020 in words is "fifty-one million, one hundred sixty-eight thousand, twenty".