20844445 has 4 divisors (see below), whose sum is σ = 25013340. Its totient is φ = 16675552.

The previous prime is 20844443. The next prime is 20844451. The reversal of 20844445 is 54444802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5391684 + 15452761 = 2322^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 20844445 - 2¹ = 20844443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084440 + ... + 2084449.

It is an arithmetic number, because the mean of its divisors is an integer number (6253335).

Almost surely, 2^20844445 is an apocalyptic number.

It is an amenable number.

20844445 is a deficient number, since it is larger than the sum of its proper divisors (4168895).

20844445 is an equidigital number, since it uses as much as digits as its factorization.

20844445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4168894.

The product of its (nonzero) digits is 20480, while the sum is 31.

The square root of 20844445 is about 4565.5717057122. The cubic root of 20844445 is about 275.2095152664.

The spelling of 20844445 in words is "twenty million, eight hundred forty-four thousand, four hundred forty-five".