22218460 has 48 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 7726400.

The previous prime is 22218419. The next prime is 22218509. The reversal of 22218460 is 6481222.

It is a happy number.

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, 2865 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (1106784).

Almost surely, 2^22218460 is an apocalyptic number.

22218460 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 22218460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26562816).

22218460 is an abundant number, since it is smaller than the sum of its proper divisors (30907172).

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

22218460 is a wasteful number, since it uses less digits than its factorization.

22218460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434 (or 4432 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 22218460 is about 4713.6461470925. The cubic root of 22218460 is about 281.1283549662.

Adding to 22218460 its reverse (6481222), we get a palindrome (28699682).

The spelling of 22218460 in words is "twenty-two million, two hundred eighteen thousand, four hundred sixty".