22087500 has 144 divisors (see below), whose sum is σ = 69995520. Its totient is φ = 5400000.

The previous prime is 22087493. The next prime is 22087511. The reversal of 22087500 is 578022.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

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, 712485 + ... + 712515.

It is an arithmetic number, because the mean of its divisors is an integer number (486080).

Almost surely, 2^22087500 is an apocalyptic number.

22087500 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 22087500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34997760).

22087500 is an abundant number, since it is smaller than the sum of its proper divisors (47908020).

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

22087500 is a wasteful number, since it uses less digits than its factorization.

22087500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 22087500 is about 4699.7340350279. The cubic root of 22087500 is about 280.5749241422.

The spelling of 22087500 in words is "twenty-two million, eighty-seven thousand, five hundred".