22006645 has 4 divisors (see below), whose sum is σ = 26407980. Its totient is φ = 17605312.

The previous prime is 22006639. The next prime is 22006657. The reversal of 22006645 is 54660022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54660022 = 2 ⋅27330011.

It can be written as a sum of positive squares in 2 ways, for example, as 13256881 + 8749764 = 3641^2 + 2958^2 .

It is a cyclic number.

It is not a de Polignac number, because 22006645 - 2⁵ = 22006613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2200660 + ... + 2200669.

It is an arithmetic number, because the mean of its divisors is an integer number (6601995).

Almost surely, 2^22006645 is an apocalyptic number.

It is an amenable number.

22006645 is a deficient number, since it is larger than the sum of its proper divisors (4401335).

22006645 is an equidigital number, since it uses as much as digits as its factorization.

22006645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401334.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 22006645 is about 4691.1240657224. The cubic root of 22006645 is about 280.2321416671.

Adding to 22006645 its reverse (54660022), we get a palindrome (76666667).

The spelling of 22006645 in words is "twenty-two million, six thousand, six hundred forty-five".