20844985 has 8 divisors (see below), whose sum is σ = 28587456. Its totient is φ = 14293680.

The previous prime is 20844983. The next prime is 20845007. The reversal of 20844985 is 58944802.

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

It is not a de Polignac number, because 20844985 - 2¹ = 20844983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20844983) 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, 297751 + ... + 297820.

It is an arithmetic number, because the mean of its divisors is an integer number (3573432).

Almost surely, 2^20844985 is an apocalyptic number.

It is an amenable number.

20844985 is a deficient number, since it is larger than the sum of its proper divisors (7742471).

20844985 is an equidigital number, since it uses as much as digits as its factorization.

20844985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595583.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20844985 is about 4565.6308435965. The cubic root of 20844985 is about 275.2118917886.

The spelling of 20844985 in words is "twenty million, eight hundred forty-four thousand, nine hundred eighty-five".