20678167 has 4 divisors (see below), whose sum is σ = 21118176. Its totient is φ = 20238160.

The previous prime is 20678159. The next prime is 20678179. The reversal of 20678167 is 76187602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20678167 - 2³ = 20678159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678117) 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 in 3 ways as a sum of consecutive naturals, for example, 219934 + ... + 220027.

It is an arithmetic number, because the mean of its divisors is an integer number (5279544).

Almost surely, 2^20678167 is an apocalyptic number.

20678167 is a deficient number, since it is larger than the sum of its proper divisors (440009).

20678167 is an equidigital number, since it uses as much as digits as its factorization.

20678167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440008.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20678167 is about 4547.3252577752. The cubic root of 20678167 is about 274.4757704478.

The spelling of 20678167 in words is "twenty million, six hundred seventy-eight thousand, one hundred sixty-seven".