22185540 has 144 divisors (see below), whose sum is σ = 76440000. Its totient is φ = 5163264.

The previous prime is 22185529. The next prime is 22185557. The reversal of 22185540 is 4558122.

It is a happy 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, 44211 + ... + 44709.

Almost surely, 2^22185540 is an apocalyptic number.

22185540 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 22185540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38220000).

22185540 is an abundant number, since it is smaller than the sum of its proper divisors (54254460).

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

22185540 is a wasteful number, since it uses less digits than its factorization.

22185540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 22185540 is about 4710.1528637614. The cubic root of 22185540 is about 280.9894416485.

The spelling of 22185540 in words is "twenty-two million, one hundred eighty-five thousand, five hundred forty".