22506215 has 8 divisors (see below), whose sum is σ = 28596240. Its totient is φ = 16945792.

The previous prime is 22506191. The next prime is 22506247. The reversal of 22506215 is 51260522.

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

It is a cyclic number.

It is not a de Polignac number, because 22506215 - 2¹⁶ = 22440679 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132305 + ... + 132474.

It is an arithmetic number, because the mean of its divisors is an integer number (3574530).

Almost surely, 2^22506215 is an apocalyptic number.

22506215 is a deficient number, since it is larger than the sum of its proper divisors (6090025).

22506215 is a wasteful number, since it uses less digits than its factorization.

22506215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264801.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 22506215 is about 4744.0715635412. The cubic root of 22506215 is about 282.3367997777.

Adding to 22506215 its reverse (51260522), we get a palindrome (73766737).

The spelling of 22506215 in words is "twenty-two million, five hundred six thousand, two hundred fifteen".