51116220 has 36 divisors (see below), whose sum is σ = 155053080. Its totient is φ = 13630944.

The previous prime is 51116173. The next prime is 51116249. The reversal of 51116220 is 2261115.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×51116220² = 5225735894176800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51116193 and 51116202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141810 + ... + 142169.

It is an arithmetic number, because the mean of its divisors is an integer number (4307030).

Almost surely, 2^51116220 is an apocalyptic number.

It is an amenable number.

51116220 is an abundant number, since it is smaller than the sum of its proper divisors (103936860).

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

51116220 is a wasteful number, since it uses less digits than its factorization.

51116220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283994 (or 283989 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51116220 is about 7149.5608256731. The cubic root of 51116220 is about 371.1244584530.

Adding to 51116220 its reverse (2261115), we get a palindrome (53377335).

The spelling of 51116220 in words is "fifty-one million, one hundred sixteen thousand, two hundred twenty".