22158180 has 216 divisors, whose sum is σ = 79881984. Its totient is φ = 4924800.

The previous prime is 22158121. The next prime is 22158229. The reversal of 22158180 is 8185122.

22158180 is a `hidden beast` number, since 2 + 2 + 1 + 581 + 80 = 666.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 714765 + ... + 714795.

It is an arithmetic number, because the mean of its divisors is an integer number (369824).

Almost surely, 2^22158180 is an apocalyptic number.

22158180 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 22158180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39940992).

22158180 is an abundant number, since it is smaller than the sum of its proper divisors (57723804).

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

22158180 is a wasteful number, since it uses less digits than its factorization.

22158180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 22158180 is about 4707.2476034303. The cubic root of 22158180 is about 280.8738853957.

The spelling of 22158180 in words is "twenty-two million, one hundred fifty-eight thousand, one hundred eighty".