20959617 has 8 divisors (see below), whose sum is σ = 31938496. Its totient is φ = 11976912.

The previous prime is 20959613. The next prime is 20959639. The reversal of 20959617 is 71695902.

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

It is not a de Polignac number, because 20959617 - 2² = 20959613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20959613) 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 7 ways as a sum of consecutive naturals, for example, 499018 + ... + 499059.

It is an arithmetic number, because the mean of its divisors is an integer number (3992312).

Almost surely, 2^20959617 is an apocalyptic number.

It is an amenable number.

20959617 is a deficient number, since it is larger than the sum of its proper divisors (10978879).

20959617 is an equidigital number, since it uses as much as digits as its factorization.

20959617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998087.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20959617 is about 4578.1674281310. The cubic root of 20959617 is about 275.7154571182.

The spelling of 20959617 in words is "twenty million, nine hundred fifty-nine thousand, six hundred seventeen".