22305440 has 24 divisors (see below), whose sum is σ = 52696980. Its totient is φ = 8922112.

The previous prime is 22305419. The next prime is 22305457. The reversal of 22305440 is 4450322.

It can be written as a sum of positive squares in 2 ways, for example, as 18905104 + 3400336 = 4348^2 + 1844^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69545 + ... + 69864.

Almost surely, 2^22305440 is an apocalyptic number.

22305440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22305440 is an abundant number, since it is smaller than the sum of its proper divisors (30391540).

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

22305440 is a wasteful number, since it uses less digits than its factorization.

22305440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139424 (or 139416 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 22305440 is about 4722.8635381514. The cubic root of 22305440 is about 281.4947275665.

Adding to 22305440 its reverse (4450322), we get a palindrome (26755762).

The spelling of 22305440 in words is "twenty-two million, three hundred five thousand, four hundred forty".