22506013 has 4 divisors (see below), whose sum is σ = 23690560. Its totient is φ = 21321468.

The previous prime is 22505947. The next prime is 22506017. The reversal of 22506013 is 31060522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31060522 = 2 ⋅15530261.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22506013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1184527 = 22506013 / (2 + 2 + 5 + 0 + 6 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22506017) 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, 592245 + ... + 592282.

It is an arithmetic number, because the mean of its divisors is an integer number (5922640).

Almost surely, 2^22506013 is an apocalyptic number.

It is an amenable number.

22506013 is a deficient number, since it is larger than the sum of its proper divisors (1184547).

22506013 is a wasteful number, since it uses less digits than its factorization.

22506013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184546.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 22506013 is about 4744.0502737640. The cubic root of 22506013 is about 282.3359550894.

Adding to 22506013 its reverse (31060522), we get a palindrome (53566535).

The spelling of 22506013 in words is "twenty-two million, five hundred six thousand, thirteen".