20443666 has 16 divisors (see below), whose sum is σ = 32500440. Its totient is φ = 9627520.

The previous prime is 20443627. The next prime is 20443667. The reversal of 20443666 is 66634402.

It can be written as a sum of positive squares in 4 ways, for example, as 14784025 + 5659641 = 3845^2 + 2379^2 .

It is not an unprimeable number, because it can be changed into a prime (20443667) 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 in 7 ways as a sum of consecutive naturals, for example, 1921 + ... + 6676.

Almost surely, 2^20443666 is an apocalyptic number.

20443666 is a deficient number, since it is larger than the sum of its proper divisors (12056774).

20443666 is a wasteful number, since it uses less digits than its factorization.

20443666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 20443666 is about 4521.4672397353. The cubic root of 20443666 is about 273.4342581232.

The spelling of 20443666 in words is "twenty million, four hundred forty-three thousand, six hundred sixty-six".