22009765 has 16 divisors (see below), whose sum is σ = 27232128. Its totient is φ = 17067456.

The previous prime is 22009763. The next prime is 22009769. The reversal of 22009765 is 56790022.

It is a cyclic number.

It is not a de Polignac number, because 22009765 - 2¹ = 22009763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22009763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35599 + ... + 36211.

It is an arithmetic number, because the mean of its divisors is an integer number (1702008).

Almost surely, 2^22009765 is an apocalyptic number.

It is an amenable number.

22009765 is a deficient number, since it is larger than the sum of its proper divisors (5222363).

22009765 is a wasteful number, since it uses less digits than its factorization.

22009765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 22009765 is about 4691.4565968364. The cubic root of 22009765 is about 280.2453843788.

Adding to 22009765 its reverse (56790022), we get a palindrome (78799787).

The spelling of 22009765 in words is "twenty-two million, nine thousand, seven hundred sixty-five".