20916959 has 8 divisors (see below), whose sum is σ = 24944640. Its totient is φ = 17149176.

The previous prime is 20916949. The next prime is 20916979. The reversal of 20916959 is 95961902.

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

It is a cyclic number.

It is not a de Polignac number, because 20916959 - 2⁴ = 20916943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916949) 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, 64799 + ... + 65120.

It is an arithmetic number, because the mean of its divisors is an integer number (3118080).

Almost surely, 2^20916959 is an apocalyptic number.

20916959 is a deficient number, since it is larger than the sum of its proper divisors (4027681).

20916959 is a wasteful number, since it uses less digits than its factorization.

20916959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129949.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 20916959 is about 4573.5062042158. The cubic root of 20916959 is about 275.5282803810.

The spelling of 20916959 in words is "twenty million, nine hundred sixteen thousand, nine hundred fifty-nine".