22256520 has 128 divisors (see below), whose sum is σ = 78503040. Its totient is φ = 4976640.

The previous prime is 22256503. The next prime is 22256527. The reversal of 22256520 is 2565222.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (22256527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16512 + ... + 17808.

It is an arithmetic number, because the mean of its divisors is an integer number (613305).

Almost surely, 2^22256520 is an apocalyptic number.

22256520 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 22256520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39251520).

22256520 is an abundant number, since it is smaller than the sum of its proper divisors (56246520).

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

22256520 is a wasteful number, since it uses less digits than its factorization.

22256520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 22256520 is about 4717.6816340232. The cubic root of 22256520 is about 281.2887867495.

It can be divided in two parts, 2 and 2256520, that added together give a palindrome (2256522).

The spelling of 22256520 in words is "twenty-two million, two hundred fifty-six thousand, five hundred twenty".