22009905 has 12 divisors (see below), whose sum is σ = 38150580. Its totient is φ = 11738592.

The previous prime is 22009859. The next prime is 22009909. The reversal of 22009905 is 50990022.

It can be written as a sum of positive squares in 2 ways, for example, as 15492096 + 6517809 = 3936^2 + 2553^2 .

It is not a de Polignac number, because 22009905 - 2⁷ = 22009777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22009909) 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, 244510 + ... + 244599.

It is an arithmetic number, because the mean of its divisors is an integer number (3179215).

Almost surely, 2^22009905 is an apocalyptic number.

It is an amenable number.

22009905 is a deficient number, since it is larger than the sum of its proper divisors (16140675).

22009905 is a wasteful number, since it uses less digits than its factorization.

22009905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489120 (or 489117 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 22009905 is about 4691.4715175518. The cubic root of 22009905 is about 280.2459785737.

Adding to 22009905 its reverse (50990022), we get a palindrome (72999927).

The spelling of 22009905 in words is "twenty-two million, nine thousand, nine hundred five".