51450220 has 24 divisors (see below), whose sum is σ = 108196704. Its totient is φ = 20551296.

The previous prime is 51450209. The next prime is 51450253. The reversal of 51450220 is 2205415.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18352 + ... + 20968.

It is an arithmetic number, because the mean of its divisors is an integer number (4508196).

Almost surely, 2^51450220 is an apocalyptic number.

It is an amenable number.

51450220 is an abundant number, since it is smaller than the sum of its proper divisors (56746484).

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

51450220 is a wasteful number, since it uses less digits than its factorization.

51450220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3607 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 51450220 is about 7172.8808717279. The cubic root of 51450220 is about 371.9310293376.

Adding to 51450220 its reverse (2205415), we get a palindrome (53655635).

The spelling of 51450220 in words is "fifty-one million, four hundred fifty thousand, two hundred twenty".