22285820 has 24 divisors (see below), whose sum is σ = 47030928. Its totient is φ = 8870400.

The previous prime is 22285819. The next prime is 22285859. The reversal of 22285820 is 2858222.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (1959622).

Almost surely, 2^22285820 is an apocalyptic number.

22285820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22285820 is an abundant number, since it is smaller than the sum of its proper divisors (24745108).

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

22285820 is a wasteful number, since it uses less digits than its factorization.

22285820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5501 (or 5499 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 22285820 is about 4720.7859515127. The cubic root of 22285820 is about 281.4121685334.

It can be divided in two parts, 2 and 2285820, that added together give a palindrome (2285822).

The spelling of 22285820 in words is "twenty-two million, two hundred eighty-five thousand, eight hundred twenty".