20843723 has 2 divisors, whose sum is σ = 20843724. Its totient is φ = 20843722.

The previous prime is 20843689. The next prime is 20843731. The reversal of 20843723 is 32734802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20843723 - 2¹⁰ = 20842699 is a prime.

It is not a weakly prime, because it can be changed into another prime (20843023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421861 + 10421862.

It is an arithmetic number, because the mean of its divisors is an integer number (10421862).

Almost surely, 2^20843723 is an apocalyptic number.

20843723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20843723 is an equidigital number, since it uses as much as digits as its factorization.

20843723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20843723 is about 4565.4926349738. The cubic root of 20843723 is about 275.2063377042.

The spelling of 20843723 in words is "twenty million, eight hundred forty-three thousand, seven hundred twenty-three".