20185708012139 has 2 divisors, whose sum is σ = 20185708012140. Its totient is φ = 20185708012138.

The previous prime is 20185708012109. The next prime is 20185708012157. The reversal of 20185708012139 is 93121080758102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20185708012139 - 2²⁴ = 20185691234923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20185708012093 and 20185708012102.

It is not a weakly prime, because it can be changed into another prime (20185708012109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092854006069 + 10092854006070.

It is an arithmetic number, because the mean of its divisors is an integer number (10092854006070).

Almost surely, 2^{20185708012139} is an apocalyptic number.

20185708012139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20185708012139 is an equidigital number, since it uses as much as digits as its factorization.

20185708012139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 20185708012139 in words is "twenty trillion, one hundred eighty-five billion, seven hundred eight million, twelve thousand, one hundred thirty-nine".