20840833 has 16 divisors (see below), whose sum is σ = 23404752. Its totient is φ = 18432000.

The previous prime is 20840789. The next prime is 20840837. The reversal of 20840833 is 33804802.

It can be written as a sum of positive squares in 8 ways, for example, as 5607424 + 15233409 = 2368^2 + 3903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20840833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20840837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32193 + ... + 32833.

It is an arithmetic number, because the mean of its divisors is an integer number (1462797).

Almost surely, 2^20840833 is an apocalyptic number.

It is an amenable number.

20840833 is a deficient number, since it is larger than the sum of its proper divisors (2563919).

20840833 is a wasteful number, since it uses less digits than its factorization.

20840833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20840833 is about 4565.1761192751. The cubic root of 20840833 is about 275.1936179183.

It can be divided in two parts, 208 and 40833, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 20840833 in words is "twenty million, eight hundred forty thousand, eight hundred thirty-three".