20078866 has 4 divisors (see below), whose sum is σ = 30118302. Its totient is φ = 10039432.

The previous prime is 20078843. The next prime is 20078867. The reversal of 20078866 is 66887002.

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., 12075625 + 8003241 = 3475^2 + 2829^2 .

It is not an unprimeable number, because it can be changed into a prime (20078867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5019715 + ... + 5019718.

Almost surely, 2^20078866 is an apocalyptic number.

20078866 is a deficient number, since it is larger than the sum of its proper divisors (10039436).

20078866 is a wasteful number, since it uses less digits than its factorization.

20078866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10039435.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 20078866 is about 4480.9447664527. The cubic root of 20078866 is about 271.7980858044.

The spelling of 20078866 in words is "twenty million, seventy-eight thousand, eight hundred sixty-six".