22331440 has 20 divisors (see below), whose sum is σ = 51920784. Its totient is φ = 8932544.

The previous prime is 22331401. The next prime is 22331453. The reversal of 22331440 is 4413322.

It is a tau number, because it is divible by the number of its divisors (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, 139492 + ... + 139651.

Almost surely, 2^22331440 is an apocalyptic number.

22331440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22331440 is an abundant number, since it is smaller than the sum of its proper divisors (29589344).

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

22331440 is a wasteful number, since it uses less digits than its factorization.

22331440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279156 (or 279150 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 22331440 is about 4725.6153038520. The cubic root of 22331440 is about 281.6040584599.

Adding to 22331440 its reverse (4413322), we get a palindrome (26744762).

The spelling of 22331440 in words is "twenty-two million, three hundred thirty-one thousand, four hundred forty".