22206645 has 12 divisors (see below), whose sum is σ = 38491596. Its totient is φ = 11843520.

The previous prime is 22206643. The next prime is 22206671. The reversal of 22206645 is 54660222.

It can be written as a sum of positive squares in 2 ways, for example, as 16184529 + 6022116 = 4023^2 + 2454^2 .

It is not a de Polignac number, because 22206645 - 2¹ = 22206643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22206643) 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 11 ways as a sum of consecutive naturals, for example, 246696 + ... + 246785.

It is an arithmetic number, because the mean of its divisors is an integer number (3207633).

Almost surely, 2^22206645 is an apocalyptic number.

It is an amenable number.

22206645 is a deficient number, since it is larger than the sum of its proper divisors (16284951).

22206645 is a wasteful number, since it uses less digits than its factorization.

22206645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493492 (or 493489 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 22206645 is about 4712.3927043488. The cubic root of 22206645 is about 281.0785147216.

Adding to 22206645 its reverse (54660222), we get a palindrome (76866867).

It can be divided in two parts, 222066 and 45, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 22206645 in words is "twenty-two million, two hundred six thousand, six hundred forty-five".