22020665 has 4 divisors (see below), whose sum is σ = 26424804. Its totient is φ = 17616528.

The previous prime is 22020659. The next prime is 22020667. The reversal of 22020665 is 56602022.

It is a happy number.

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 16908544 + 5112121 = 4112^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020665 - 2⁸ = 22020409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22020665.

It is not an unprimeable number, because it can be changed into a prime (22020667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202062 + ... + 2202071.

It is an arithmetic number, because the mean of its divisors is an integer number (6606201).

Almost surely, 2^22020665 is an apocalyptic number.

It is an amenable number.

22020665 is a deficient number, since it is larger than the sum of its proper divisors (4404139).

22020665 is an equidigital number, since it uses as much as digits as its factorization.

22020665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404138.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 22020665 is about 4692.6181391628. The cubic root of 22020665 is about 280.2916391596.

Adding to 22020665 its reverse (56602022), we get a palindrome (78622687).

The spelling of 22020665 in words is "twenty-two million, twenty thousand, six hundred sixty-five".