22305640 has 128 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 7096320.

The previous prime is 22305623. The next prime is 22305641. The reversal of 22305640 is 4650322.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22305641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 332887 + ... + 332953.

It is an arithmetic number, because the mean of its divisors is an integer number (481950).

Almost surely, 2^22305640 is an apocalyptic number.

22305640 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 22305640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

22305640 is an abundant number, since it is smaller than the sum of its proper divisors (39383960).

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

22305640 is a wasteful number, since it uses less digits than its factorization.

22305640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 22305640 is about 4722.8847116990. The cubic root of 22305640 is about 281.4955688976.

Adding to 22305640 its reverse (4650322), we get a palindrome (26955962).

The spelling of 22305640 in words is "twenty-two million, three hundred five thousand, six hundred forty".