20085520789643 has 2 divisors, whose sum is σ = 20085520789644. Its totient is φ = 20085520789642.

The previous prime is 20085520789619. The next prime is 20085520789673. The reversal of 20085520789643 is 34698702558002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20085520789643 - 2⁸ = 20085520789387 is a prime.

It is not a weakly prime, because it can be changed into another prime (20085520789613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042760394821 + 10042760394822.

It is an arithmetic number, because the mean of its divisors is an integer number (10042760394822).

Almost surely, 2^{20085520789643} is an apocalyptic number.

20085520789643 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085520789643 is an equidigital number, since it uses as much as digits as its factorization.

20085520789643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 20085520789643 in words is "twenty trillion, eighty-five billion, five hundred twenty million, seven hundred eighty-nine thousand, six hundred forty-three".