20704843 has 2 divisors, whose sum is σ = 20704844. Its totient is φ = 20704842.

The previous prime is 20704837. The next prime is 20704883. The reversal of 20704843 is 34840702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20704843 is a prime.

It is not a weakly prime, because it can be changed into another prime (20704883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352421 + 10352422.

It is an arithmetic number, because the mean of its divisors is an integer number (10352422).

Almost surely, 2^20704843 is an apocalyptic number.

20704843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704843 is an equidigital number, since it uses as much as digits as its factorization.

20704843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20704843 is about 4550.2574652430. The cubic root of 20704843 is about 274.5937494632.

The spelling of 20704843 in words is "twenty million, seven hundred four thousand, eight hundred forty-three".