20312302139 has 2 divisors, whose sum is σ = 20312302140. Its totient is φ = 20312302138.

The previous prime is 20312302111. The next prime is 20312302189. The reversal of 20312302139 is 93120321302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312302139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312302189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156151069 + 10156151070.

It is an arithmetic number, because the mean of its divisors is an integer number (10156151070).

Almost surely, 2^20312302139 is an apocalyptic number.

20312302139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312302139 is an equidigital number, since it uses as much as digits as its factorization.

20312302139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 20312302139 in words is "twenty billion, three hundred twelve million, three hundred two thousand, one hundred thirty-nine".