20785099843 has 2 divisors, whose sum is σ = 20785099844. Its totient is φ = 20785099842.

The previous prime is 20785099831. The next prime is 20785099859. The reversal of 20785099843 is 34899058702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20785099843 - 2⁹ = 20785099331 is a prime.

It is not a weakly prime, because it can be changed into another prime (20785099813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392549921 + 10392549922.

It is an arithmetic number, because the mean of its divisors is an integer number (10392549922).

Almost surely, 2^20785099843 is an apocalyptic number.

20785099843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20785099843 is an equidigital number, since it uses as much as digits as its factorization.

20785099843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 20785099843 in words is "twenty billion, seven hundred eighty-five million, ninety-nine thousand, eight hundred forty-three".