20844961 has 8 divisors (see below), whose sum is σ = 21302784. Its totient is φ = 20391840.

The previous prime is 20844959. The next prime is 20844977. The reversal of 20844961 is 16944802.

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 20844961 - 2¹ = 20844959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20844361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8656 + ... + 10798.

It is an arithmetic number, because the mean of its divisors is an integer number (2662848).

Almost surely, 2^20844961 is an apocalyptic number.

It is an amenable number.

20844961 is a deficient number, since it is larger than the sum of its proper divisors (457823).

20844961 is a wasteful number, since it uses less digits than its factorization.

20844961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20844961 is about 4565.6282152624. The cubic root of 20844961 is about 275.2117861662.

The spelling of 20844961 in words is "twenty million, eight hundred forty-four thousand, nine hundred sixty-one".