22506447 has 8 divisors (see below), whose sum is σ = 30090544. Its totient is φ = 14963328.

The previous prime is 22506437. The next prime is 22506479. The reversal of 22506447 is 74460522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22506447 - 2⁶ = 22506383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22506437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8938 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (3761318).

Almost surely, 2^22506447 is an apocalyptic number.

22506447 is a deficient number, since it is larger than the sum of its proper divisors (7584097).

22506447 is a wasteful number, since it uses less digits than its factorization.

22506447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20489.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 22506447 is about 4744.0960150486. The cubic root of 22506447 is about 282.3377699084.

Adding to 22506447 its reverse (74460522), we get a palindrome (96966969).

The spelling of 22506447 in words is "twenty-two million, five hundred six thousand, four hundred forty-seven".