22556240 has 80 divisors (see below), whose sum is σ = 61281792. Its totient is φ = 7560192.

The previous prime is 22556239. The next prime is 22556257. The reversal of 22556240 is 4265522.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-4 number, since 4×22556240⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25892 + ... + 26748.

Almost surely, 2^22556240 is an apocalyptic number.

22556240 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 22556240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30640896).

22556240 is an abundant number, since it is smaller than the sum of its proper divisors (38725552).

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

22556240 is a wasteful number, since it uses less digits than its factorization.

22556240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 22556240 is about 4749.3410069187. The cubic root of 22556240 is about 282.5458301399.

It can be divided in two parts, 225 and 56240, that added together give a palindrome (56465).

The spelling of 22556240 in words is "twenty-two million, five hundred fifty-six thousand, two hundred forty".