20678066 has 4 divisors (see below), whose sum is σ = 31017102. Its totient is φ = 10339032.

The previous prime is 20678059. The next prime is 20678083. The reversal of 20678066 is 66087602.

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., 15484225 + 5193841 = 3935^2 + 2279^2 .

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, 5169515 + ... + 5169518.

Almost surely, 2^20678066 is an apocalyptic number.

20678066 is a deficient number, since it is larger than the sum of its proper divisors (10339036).

20678066 is a wasteful number, since it uses less digits than its factorization.

20678066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339035.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20678066 is about 4547.3141523321. The cubic root of 20678066 is about 274.4753235659.

The spelling of 20678066 in words is "twenty million, six hundred seventy-eight thousand, sixty-six".