22404540 has 48 divisors (see below), whose sum is σ = 62985888. Its totient is φ = 5950464.

The previous prime is 22404539. The next prime is 22404541. The reversal of 22404540 is 4540422.

It is an interprime number because it is at equal distance from previous prime (22404539) and next prime (22404541).

It is a super-2 number, since 2×22404540² = 1003926825223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22404541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18184 + ... + 19376.

It is an arithmetic number, because the mean of its divisors is an integer number (1312206).

Almost surely, 2^22404540 is an apocalyptic number.

22404540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22404540 is an abundant number, since it is smaller than the sum of its proper divisors (40581348).

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

22404540 is a wasteful number, since it uses less digits than its factorization.

22404540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 22404540 is about 4733.3434272193. The cubic root of 22404540 is about 281.9109924820.

Adding to 22404540 its reverse (4540422), we get a palindrome (26944962).

The spelling of 22404540 in words is "twenty-two million, four hundred four thousand, five hundred forty".