20834861 has 2 divisors, whose sum is σ = 20834862. Its totient is φ = 20834860.

The previous prime is 20834851. The next prime is 20834873. The reversal of 20834861 is 16843802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 7946761 = 3590^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 20834861 - 2⁶ = 20834797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20834851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10417430 + 10417431.

It is an arithmetic number, because the mean of its divisors is an integer number (10417431).

Almost surely, 2^20834861 is an apocalyptic number.

It is an amenable number.

20834861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20834861 is an equidigital number, since it uses as much as digits as its factorization.

20834861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20834861 is about 4564.5219903074. The cubic root of 20834861 is about 275.1673295691.

The spelling of 20834861 in words is "twenty million, eight hundred thirty-four thousand, eight hundred sixty-one".