22220666 has 16 divisors (see below), whose sum is σ = 38007144. Its totient is φ = 9652224.

The previous prime is 22220651. The next prime is 22220713. The reversal of 22220666 is 66602222.

It can be written as a sum of positive squares in 4 ways, for example, as 19175641 + 3045025 = 4379^2 + 1745^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24695 + ... + 25578.

Almost surely, 2^22220666 is an apocalyptic number.

22220666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

22220666 is a deficient number, since it is larger than the sum of its proper divisors (15786478).

22220666 is a wasteful number, since it uses less digits than its factorization.

22220666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50305.

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

The square root of 22220666 is about 4713.8801427274. The cubic root of 22220666 is about 281.1376587708.

Adding to 22220666 its reverse (66602222), we get a palindrome (88822888).

The spelling of 22220666 in words is "twenty-two million, two hundred twenty thousand, six hundred sixty-six".