20166746 has 4 divisors (see below), whose sum is σ = 30250122. Its totient is φ = 10083372.

The previous prime is 20166721. The next prime is 20166767. The reversal of 20166746 is 64766102.

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

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 15625 = 4489^2 + 125^2 .

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 as a sum of consecutive naturals, namely, 5041685 + ... + 5041688.

Almost surely, 2^20166746 is an apocalyptic number.

20166746 is a deficient number, since it is larger than the sum of its proper divisors (10083376).

20166746 is a wasteful number, since it uses less digits than its factorization.

20166746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10083375.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20166746 is about 4490.7400281023. The cubic root of 20166746 is about 272.1940386637.

The spelling of 20166746 in words is "twenty million, one hundred sixty-six thousand, seven hundred forty-six".