22506145 has 4 divisors (see below), whose sum is σ = 27007380. Its totient is φ = 18004912.

The previous prime is 22506109. The next prime is 22506149. The reversal of 22506145 is 54160522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2934369 + 19571776 = 1713^2 + 4424^2 .

It is a cyclic number.

It is not a de Polignac number, because 22506145 - 2⁷ = 22506017 is a prime.

It is a super-2 number, since 2×22506145² = 1013053125522050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22506149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250610 + ... + 2250619.

It is an arithmetic number, because the mean of its divisors is an integer number (6751845).

Almost surely, 2^22506145 is an apocalyptic number.

It is an amenable number.

22506145 is a deficient number, since it is larger than the sum of its proper divisors (4501235).

22506145 is an equidigital number, since it uses as much as digits as its factorization.

22506145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501234.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 22506145 is about 4744.0641859064. The cubic root of 22506145 is about 282.3365070645.

Adding to 22506145 its reverse (54160522), we get a palindrome (76666667).

The spelling of 22506145 in words is "twenty-two million, five hundred six thousand, one hundred forty-five".