20967199 has 4 divisors (see below), whose sum is σ = 22873320. Its totient is φ = 19061080.

The previous prime is 20967161. The next prime is 20967209. The reversal of 20967199 is 99176902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20967199 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 (20967109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953044 + ... + 953065.

It is an arithmetic number, because the mean of its divisors is an integer number (5718330).

Almost surely, 2^20967199 is an apocalyptic number.

20967199 is a deficient number, since it is larger than the sum of its proper divisors (1906121).

20967199 is a wasteful number, since it uses less digits than its factorization.

20967199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906120.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 20967199 is about 4578.9954138435. The cubic root of 20967199 is about 275.7486991788.

The spelling of 20967199 in words is "twenty million, nine hundred sixty-seven thousand, one hundred ninety-nine".