20873665843 has 2 divisors, whose sum is σ = 20873665844. Its totient is φ = 20873665842.

The previous prime is 20873665831. The next prime is 20873665853. The reversal of 20873665843 is 34856637802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20873665843 - 2⁵ = 20873665811 is a prime.

It is not a weakly prime, because it can be changed into another prime (20873665853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10436832921 + 10436832922.

It is an arithmetic number, because the mean of its divisors is an integer number (10436832922).

Almost surely, 2^20873665843 is an apocalyptic number.

20873665843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20873665843 is an equidigital number, since it uses as much as digits as its factorization.

20873665843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 20873665843 in words is "twenty billion, eight hundred seventy-three million, six hundred sixty-five thousand, eight hundred forty-three".