22405540 has 12 divisors (see below), whose sum is σ = 47051676. Its totient is φ = 8962208.

The previous prime is 22405501. The next prime is 22405547. The reversal of 22405540 is 4550422.

It can be written as a sum of positive squares in 2 ways, for example, as 11329956 + 11075584 = 3366^2 + 3328^2 .

It is not an unprimeable number, because it can be changed into a prime (22405547) 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, 560119 + ... + 560158.

It is an arithmetic number, because the mean of its divisors is an integer number (3920973).

Almost surely, 2^22405540 is an apocalyptic number.

22405540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22405540 is an abundant number, since it is smaller than the sum of its proper divisors (24646136).

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

22405540 is a wasteful number, since it uses less digits than its factorization.

22405540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120286 (or 1120284 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 22405540 is about 4733.4490596182. The cubic root of 22405540 is about 281.9151866735.

Adding to 22405540 its reverse (4550422), we get a palindrome (26955962).

The spelling of 22405540 in words is "twenty-two million, four hundred five thousand, five hundred forty".