20440666 has 8 divisors (see below), whose sum is σ = 30680244. Its totient is φ = 10213920.

The previous prime is 20440649. The next prime is 20440691. The reversal of 20440666 is 66604402.

It can be written as a sum of positive squares in 2 ways, for example, as 20439441 + 1225 = 4521^2 + 35^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4176 + ... + 7636.

Almost surely, 2^20440666 is an apocalyptic number.

20440666 is a deficient number, since it is larger than the sum of its proper divisors (10239578).

20440666 is a wasteful number, since it uses less digits than its factorization.

20440666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20440666 is about 4521.1354768465. The cubic root of 20440666 is about 273.4208824579.

The spelling of 20440666 in words is "twenty million, four hundred forty thousand, six hundred sixty-six".