20178146 has 4 divisors (see below), whose sum is σ = 30267222. Its totient is φ = 10089072.

The previous prime is 20178143. The next prime is 20178157. The reversal of 20178146 is 64187102.

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., 14707225 + 5470921 = 3835^2 + 2339^2 .

It is not an unprimeable number, because it can be changed into a prime (20178143) 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 as a sum of consecutive naturals, namely, 5044535 + ... + 5044538.

Almost surely, 2^20178146 is an apocalyptic number.

20178146 is a deficient number, since it is larger than the sum of its proper divisors (10089076).

20178146 is a wasteful number, since it uses less digits than its factorization.

20178146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10089075.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20178146 is about 4492.0091273282. The cubic root of 20178146 is about 272.2453182558.

The spelling of 20178146 in words is "twenty million, one hundred seventy-eight thousand, one hundred forty-six".