20380864139 has 2 divisors, whose sum is σ = 20380864140. Its totient is φ = 20380864138.

The previous prime is 20380864117. The next prime is 20380864247. The reversal of 20380864139 is 93146808302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20380864139 is a prime.

It is a super-2 number, since 2×20380864139² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20380864139.

It is not a weakly prime, because it can be changed into another prime (20380864109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190432069 + 10190432070.

It is an arithmetic number, because the mean of its divisors is an integer number (10190432070).

Almost surely, 2^20380864139 is an apocalyptic number.

20380864139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380864139 is an equidigital number, since it uses as much as digits as its factorization.

20380864139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20380864139 in words is "twenty billion, three hundred eighty million, eight hundred sixty-four thousand, one hundred thirty-nine".