20947199 has 8 divisors (see below), whose sum is σ = 25781280. Its totient is φ = 16573536.

The previous prime is 20947189. The next prime is 20947211. The reversal of 20947199 is 99174902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20947199 - 2⁸ = 20946943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115004 + ... + 115185.

It is an arithmetic number, because the mean of its divisors is an integer number (3222660).

Almost surely, 2^20947199 is an apocalyptic number.

20947199 is a deficient number, since it is larger than the sum of its proper divisors (4834081).

20947199 is a wasteful number, since it uses less digits than its factorization.

20947199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230209.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 20947199 is about 4576.8110076777. The cubic root of 20947199 is about 275.6609950711.

The spelling of 20947199 in words is "twenty million, nine hundred forty-seven thousand, one hundred ninety-nine".