20066671 has 4 divisors (see below), whose sum is σ = 20556144. Its totient is φ = 19577200.

The previous prime is 20066639. The next prime is 20066687. The reversal of 20066671 is 17666002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20066671 - 2⁵ = 20066639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066611) 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 3 ways as a sum of consecutive naturals, for example, 244675 + ... + 244756.

It is an arithmetic number, because the mean of its divisors is an integer number (5139036).

Almost surely, 2^20066671 is an apocalyptic number.

20066671 is a deficient number, since it is larger than the sum of its proper divisors (489473).

20066671 is an equidigital number, since it uses as much as digits as its factorization.

20066671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489472.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20066671 is about 4479.5837976312. The cubic root of 20066671 is about 271.7430486835.

The spelling of 20066671 in words is "twenty million, sixty-six thousand, six hundred seventy-one".