51085220 has 12 divisors (see below), whose sum is σ = 107279004. Its totient is φ = 20434080.

The previous prime is 51085213. The next prime is 51085249. The reversal of 51085220 is 2258015.

It can be written as a sum of positive squares in 2 ways, for example, as 24542116 + 26543104 = 4954^2 + 5152^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277111 + ... + 1277150.

It is an arithmetic number, because the mean of its divisors is an integer number (8939917).

Almost surely, 2^51085220 is an apocalyptic number.

It is an amenable number.

51085220 is an abundant number, since it is smaller than the sum of its proper divisors (56193784).

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

51085220 is a wasteful number, since it uses less digits than its factorization.

51085220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554270 (or 2554268 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 51085220 is about 7147.3925315460. The cubic root of 51085220 is about 371.0494190967.

The spelling of 51085220 in words is "fifty-one million, eighty-five thousand, two hundred twenty".