20812384139 has 4 divisors (see below), whose sum is σ = 20848833720. Its totient is φ = 20775934560.

The previous prime is 20812384123. The next prime is 20812384189. The reversal of 20812384139 is 93148321802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93148321802 = 2 ⋅46574160901.

It is a cyclic number.

It is not a de Polignac number, because 20812384139 - 2⁴ = 20812384123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20812384096 and 20812384105.

It is not an unprimeable number, because it can be changed into a prime (20812384189) 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 in 3 ways as a sum of consecutive naturals, for example, 18223934 + ... + 18225075.

It is an arithmetic number, because the mean of its divisors is an integer number (5212208430).

Almost surely, 2^20812384139 is an apocalyptic number.

20812384139 is a deficient number, since it is larger than the sum of its proper divisors (36449581).

20812384139 is an equidigital number, since it uses as much as digits as its factorization.

20812384139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36449580.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 20812384139 in words is "twenty billion, eight hundred twelve million, three hundred eighty-four thousand, one hundred thirty-nine".