20222666 has 4 divisors (see below), whose sum is σ = 30334002. Its totient is φ = 10111332.

The previous prime is 20222621. The next prime is 20222689. The reversal of 20222666 is 66622202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1256641 = 4355^2 + 1121^2 .

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 as a sum of consecutive naturals, namely, 5055665 + ... + 5055668.

Almost surely, 2^20222666 is an apocalyptic number.

20222666 is a deficient number, since it is larger than the sum of its proper divisors (10111336).

20222666 is a wasteful number, since it uses less digits than its factorization.

20222666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111335.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20222666 is about 4496.9618633028. The cubic root of 20222666 is about 272.4453937660.

Adding to 20222666 its reverse (66622202), we get a palindrome (86844868).

The spelling of 20222666 in words is "twenty million, two hundred twenty-two thousand, six hundred sixty-six".