20381748139 has 2 divisors, whose sum is σ = 20381748140. Its totient is φ = 20381748138.

The previous prime is 20381748131. The next prime is 20381748161. The reversal of 20381748139 is 93184718302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20381748139 - 2³ = 20381748131 is a prime.

It is not a weakly prime, because it can be changed into another prime (20381748131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190874069 + 10190874070.

It is an arithmetic number, because the mean of its divisors is an integer number (10190874070).

Almost surely, 2^20381748139 is an apocalyptic number.

20381748139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381748139 is an equidigital number, since it uses as much as digits as its factorization.

20381748139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 20381748139 in words is "twenty billion, three hundred eighty-one million, seven hundred forty-eight thousand, one hundred thirty-nine".