22545440 has 24 divisors (see below), whose sum is σ = 53263980. Its totient is φ = 9018112.

The previous prime is 22545437. The next prime is 22545443. The reversal of 22545440 is 4454522.

It is an interprime number because it is at equal distance from previous prime (22545437) and next prime (22545443).

It can be written as a sum of positive squares in 2 ways, for example, as 22543504 + 1936 = 4748^2 + 44^2 .

It is not an unprimeable number, because it can be changed into a prime (22545443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70295 + ... + 70614.

Almost surely, 2^22545440 is an apocalyptic number.

22545440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22545440 is an abundant number, since it is smaller than the sum of its proper divisors (30718540).

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

22545440 is a wasteful number, since it uses less digits than its factorization.

22545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140924 (or 140916 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 22545440 is about 4748.2038709390. The cubic root of 22545440 is about 282.5007283245.

Adding to 22545440 its reverse (4454522), we get a palindrome (26999962).

The spelling of 22545440 in words is "twenty-two million, five hundred forty-five thousand, four hundred forty".