20000843 has 2 divisors, whose sum is σ = 20000844. Its totient is φ = 20000842.

The previous prime is 20000839. The next prime is 20000861. The reversal of 20000843 is 34800002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20000843 - 2² = 20000839 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20000873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000421 + 10000422.

It is an arithmetic number, because the mean of its divisors is an integer number (10000422).

Almost surely, 2^20000843 is an apocalyptic number.

20000843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000843 is an equidigital number, since it uses as much as digits as its factorization.

20000843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20000843 is about 4472.2302042717. The cubic root of 20000843 is about 271.4455753627.

Adding to 20000843 its reverse (34800002), we get a palindrome (54800845).

The spelling of 20000843 in words is "twenty million, eight hundred forty-three", and thus it is an aban number.