20607666 has 32 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 6347520.

The previous prime is 20607641. The next prime is 20607673. The reversal of 20607666 is 66670602.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2470 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^20607666 is an apocalyptic number.

20607666 is an abundant number, since it is smaller than the sum of its proper divisors (23845134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20607666 is a wasteful number, since it uses less digits than its factorization.

20607666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20607666 is about 4539.5667194128. The cubic root of 20607666 is about 274.1634789076.

The spelling of 20607666 in words is "twenty million, six hundred seven thousand, six hundred sixty-six".