20846992139 has 4 divisors (see below), whose sum is σ = 20894051256. Its totient is φ = 20799933024.

The previous prime is 20846992121. The next prime is 20846992193. The reversal of 20846992139 is 93129964802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20846992139 - 2⁸ = 20846991883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20846997139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23528894 + ... + 23529779.

It is an arithmetic number, because the mean of its divisors is an integer number (5223512814).

Almost surely, 2^20846992139 is an apocalyptic number.

20846992139 is a deficient number, since it is larger than the sum of its proper divisors (47059117).

20846992139 is an equidigital number, since it uses as much as digits as its factorization.

20846992139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47059116.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 20846992139 in words is "twenty billion, eight hundred forty-six million, nine hundred ninety-two thousand, one hundred thirty-nine".