20222665 has 4 divisors (see below), whose sum is σ = 24267204. Its totient is φ = 16178128.

The previous prime is 20222621. The next prime is 20222689. The reversal of 20222665 is 56622202.

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 7683984 + 12538681 = 2772^2 + 3541^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222665 - 2¹⁹ = 19698377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022262 + ... + 2022271.

It is an arithmetic number, because the mean of its divisors is an integer number (6066801).

Almost surely, 2^20222665 is an apocalyptic number.

It is an amenable number.

20222665 is a deficient number, since it is larger than the sum of its proper divisors (4044539).

20222665 is an equidigital number, since it uses as much as digits as its factorization.

20222665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044538.

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

The square root of 20222665 is about 4496.9617521166. The cubic root of 20222665 is about 272.4453892752.

Adding to 20222665 its reverse (56622202), we get a palindrome (76844867).

The spelling of 20222665 in words is "twenty million, two hundred twenty-two thousand, six hundred sixty-five".