22220266 has 4 divisors (see below), whose sum is σ = 33330402. Its totient is φ = 11110132.

The previous prime is 22220257. The next prime is 22220267. The reversal of 22220266 is 66202222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66202222 = 2 ⋅33101111.

It can be written as a sum of positive squares in only one way, i.e., 22043025 + 177241 = 4695^2 + 421^2 .

It is a super-2 number, since 2×22220266² = 987480442221512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22220267) 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 as a sum of consecutive naturals, namely, 5555065 + ... + 5555068.

Almost surely, 2^22220266 is an apocalyptic number.

22220266 is a deficient number, since it is larger than the sum of its proper divisors (11110136).

22220266 is a wasteful number, since it uses less digits than its factorization.

22220266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110135.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 22220266 is about 4713.8377146440. The cubic root of 22220266 is about 281.1359718165.

Adding to 22220266 its reverse (66202222), we get a palindrome (88422488).

The spelling of 22220266 in words is "twenty-two million, two hundred twenty thousand, two hundred sixty-six".