20166745 has 16 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 14897344.

The previous prime is 20166721. The next prime is 20166767. The reversal of 20166745 is 54766102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20166745 - 2⁷ = 20166617 is a prime.

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, 312 + ... + 6358.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^20166745 is an apocalyptic number.

It is an amenable number.

20166745 is a deficient number, since it is larger than the sum of its proper divisors (5960615).

20166745 is a wasteful number, since it uses less digits than its factorization.

20166745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6104.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20166745 is about 4490.7399167620. The cubic root of 20166745 is about 272.1940341646.

The spelling of 20166745 in words is "twenty million, one hundred sixty-six thousand, seven hundred forty-five".