20994167 has 4 divisors (see below), whose sum is σ = 22229136. Its totient is φ = 19759200.

The previous prime is 20994151. The next prime is 20994179. The reversal of 20994167 is 76149902.

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 20994167 - 2⁴ = 20994151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20994167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617459 + ... + 617492.

It is an arithmetic number, because the mean of its divisors is an integer number (5557284).

Almost surely, 2^20994167 is an apocalyptic number.

20994167 is a deficient number, since it is larger than the sum of its proper divisors (1234969).

20994167 is a wasteful number, since it uses less digits than its factorization.

20994167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234968.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20994167 is about 4581.9392182787. The cubic root of 20994167 is about 275.8668711382.

The spelling of 20994167 in words is "twenty million, nine hundred ninety-four thousand, one hundred sixty-seven".