22355440 has 20 divisors (see below), whose sum is σ = 51976584. Its totient is φ = 8942144.

The previous prime is 22355423. The next prime is 22355477. The reversal of 22355440 is 4455322.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139642 + ... + 139801.

Almost surely, 2^22355440 is an apocalyptic number.

22355440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22355440 is an abundant number, since it is smaller than the sum of its proper divisors (29621144).

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

22355440 is a wasteful number, since it uses less digits than its factorization.

22355440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279456 (or 279450 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 22355440 is about 4728.1539738042. The cubic root of 22355440 is about 281.7049039896.

The spelling of 22355440 in words is "twenty-two million, three hundred fifty-five thousand, four hundred forty".