20000844 has 84 divisors (see below), whose sum is σ = 55393240. Its totient is φ = 6316056.

The previous prime is 20000843. The next prime is 20000861. The reversal of 20000844 is 44800002.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20000843) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1052667 + ... + 1052685.

Almost surely, 2^20000844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20000844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27696620).

20000844 is an abundant number, since it is smaller than the sum of its proper divisors (35392396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20000844 is an frugal number, since it uses more digits than its factorization.

20000844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 24 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20000844 is about 4472.2303160727. The cubic root of 20000844 is about 271.4455798866.

Adding to 20000844 its reverse (44800002), we get a palindrome (64800846).

The spelling of 20000844 in words is "twenty million, eight hundred forty-four", and thus it is an aban number.