2255220 has 144 divisors (see below), whose sum is σ = 8019648. Its totient is φ = 506880.

The previous prime is 2255191. The next prime is 2255233. The reversal of 2255220 is 225522.

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 = 2255193 and 2255202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33627 + ... + 33693.

It is an arithmetic number, because the mean of its divisors is an integer number (55692).

2^2255220 is an apocalyptic number.

2255220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2255220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4009824).

2255220 is an abundant number, since it is smaller than the sum of its proper divisors (5764428).

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

2255220 is a wasteful number, since it uses less digits than its factorization.

2255220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 2255220 is about 1501.7389919690. The cubic root of 2255220 is about 131.1383267792.

It can be divided in two parts, 225 and 5220, that added together give a palindrome (5445).

The spelling of 2255220 in words is "two million, two hundred fifty-five thousand, two hundred twenty".