20996961 has 8 divisors (see below), whose sum is σ = 28678944. Its totient is φ = 13656480.

The previous prime is 20996959. The next prime is 20996977. The reversal of 20996961 is 16969902.

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 20996961 - 2¹ = 20996959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20996461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85231 + ... + 85476.

It is an arithmetic number, because the mean of its divisors is an integer number (3584868).

Almost surely, 2^20996961 is an apocalyptic number.

It is an amenable number.

20996961 is a deficient number, since it is larger than the sum of its proper divisors (7681983).

20996961 is a wasteful number, since it uses less digits than its factorization.

20996961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170751.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20996961 is about 4582.2441008746. The cubic root of 20996961 is about 275.8791084714.

The spelling of 20996961 in words is "twenty million, nine hundred ninety-six thousand, nine hundred sixty-one".