22500000 has 144 divisors (see below), whose sum is σ = 79980264. Its totient is φ = 6000000.

The previous prime is 22499999. The next prime is 22500011. The reversal of 22500000 is 522.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 13571856 + 8928144 = 3684^2 + 2988^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4499998 + ... + 4500002.

Almost surely, 2^22500000 is an apocalyptic number.

22500000 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 22500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39990132).

22500000 is an abundant number, since it is smaller than the sum of its proper divisors (57480264).

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

22500000 is an frugal number, since it uses more digits than its factorization.

22500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 22500000 is about 4743.4164902526. The cubic root of 22500000 is about 282.3108086643.

Adding to 22500000 its reverse (522), we get a palindrome (22500522).

The spelling of 22500000 in words is "twenty-two million, five hundred thousand".