20438350139 has 2 divisors, whose sum is σ = 20438350140. Its totient is φ = 20438350138.

The previous prime is 20438350109. The next prime is 20438350151. The reversal of 20438350139 is 93105383402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20438350139 - 2²⁴ = 20421572923 is a prime.

It is a super-2 number, since 2×20438350139² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20438350109) 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 as a sum of consecutive naturals, namely, 10219175069 + 10219175070.

It is an arithmetic number, because the mean of its divisors is an integer number (10219175070).

Almost surely, 2^20438350139 is an apocalyptic number.

20438350139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20438350139 is an equidigital number, since it uses as much as digits as its factorization.

20438350139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 20438350139 in words is "twenty billion, four hundred thirty-eight million, three hundred fifty thousand, one hundred thirty-nine".