22165900 has 18 divisors (see below), whose sum is σ = 48100220. Its totient is φ = 8866320.

The previous prime is 22165883. The next prime is 22165901. The reversal of 22165900 is 956122.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (22165901) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 110730 + ... + 110929.

Almost surely, 2^22165900 is an apocalyptic number.

22165900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22165900 is an abundant number, since it is smaller than the sum of its proper divisors (25934320).

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

22165900 is a wasteful number, since it uses less digits than its factorization.

22165900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221673 (or 221666 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 22165900 is about 4708.0675441204. The cubic root of 22165900 is about 280.9065008094.

The spelling of 22165900 in words is "twenty-two million, one hundred sixty-five thousand, nine hundred".