22581540 has 36 divisors (see below), whose sum is σ = 68497884. Its totient is φ = 6021696.

The previous prime is 22581539. The next prime is 22581541. The reversal of 22581540 is 4518522.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22581539) and next prime (22581541).

It can be written as a sum of positive squares in 2 ways, for example, as 8156736 + 14424804 = 2856^2 + 3798^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (22581541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62547 + ... + 62906.

It is an arithmetic number, because the mean of its divisors is an integer number (1902719).

Almost surely, 2^22581540 is an apocalyptic number.

22581540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22581540 is an abundant number, since it is smaller than the sum of its proper divisors (45916344).

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

22581540 is a wasteful number, since it uses less digits than its factorization.

22581540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125468 (or 125463 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 22581540 is about 4752.0037878773. The cubic root of 22581540 is about 282.6514289826.

The spelling of 22581540 in words is "twenty-two million, five hundred eighty-one thousand, five hundred forty".