55105220 has 24 divisors (see below), whose sum is σ = 119712600. Its totient is φ = 21281792.

The previous prime is 55105207. The next prime is 55105243. The reversal of 55105220 is 2250155.

It can be written as a sum of positive squares in 4 ways, for example, as 3034564 + 52070656 = 1742^2 + 7216^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 55105192 and 55105201.

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, 46925 + ... + 48084.

It is an arithmetic number, because the mean of its divisors is an integer number (4988025).

Almost surely, 2^55105220 is an apocalyptic number.

It is an amenable number.

55105220 is an abundant number, since it is smaller than the sum of its proper divisors (64607380).

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

55105220 is a wasteful number, since it uses less digits than its factorization.

55105220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95047 (or 95045 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 55105220 is about 7423.2890284563. The cubic root of 55105220 is about 380.5376047164.

Adding to 55105220 its reverse (2250155), we get a palindrome (57355375).

The spelling of 55105220 in words is "fifty-five million, one hundred five thousand, two hundred twenty".