20164906 has 4 divisors (see below), whose sum is σ = 30247362. Its totient is φ = 10082452.

The previous prime is 20164901. The next prime is 20164913. The reversal of 20164906 is 60946102.

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., 17715681 + 2449225 = 4209^2 + 1565^2 .

It is not an unprimeable number, because it can be changed into a prime (20164901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5041225 + ... + 5041228.

Almost surely, 2^20164906 is an apocalyptic number.

20164906 is a deficient number, since it is larger than the sum of its proper divisors (10082456).

20164906 is a wasteful number, since it uses less digits than its factorization.

20164906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10082455.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20164906 is about 4490.5351574172. The cubic root of 20164906 is about 272.1857601464.

The spelling of 20164906 in words is "twenty million, one hundred sixty-four thousand, nine hundred six".