20843851843 has 2 divisors, whose sum is σ = 20843851844. Its totient is φ = 20843851842.

The previous prime is 20843851811. The next prime is 20843851883. The reversal of 20843851843 is 34815834802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20843851843 - 2⁵ = 20843851811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20843851793 and 20843851802.

It is not a weakly prime, because it can be changed into another prime (20843851883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421925921 + 10421925922.

It is an arithmetic number, because the mean of its divisors is an integer number (10421925922).

Almost surely, 2^20843851843 is an apocalyptic number.

20843851843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20843851843 is an equidigital number, since it uses as much as digits as its factorization.

20843851843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 46.

It can be divided in two parts, 208438 and 51843, that added together give a triangular number (260281 = T₇₂₁).

The spelling of 20843851843 in words is "twenty billion, eight hundred forty-three million, eight hundred fifty-one thousand, eight hundred forty-three".