20306511139 has 2 divisors, whose sum is σ = 20306511140. Its totient is φ = 20306511138.

The previous prime is 20306511077. The next prime is 20306511143. The reversal of 20306511139 is 93111560302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20306511139 - 2¹⁵ = 20306478371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20306511139.

It is not a weakly prime, because it can be changed into another prime (20306511179) 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, 10153255569 + 10153255570.

It is an arithmetic number, because the mean of its divisors is an integer number (10153255570).

Almost surely, 2^20306511139 is an apocalyptic number.

20306511139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306511139 is an equidigital number, since it uses as much as digits as its factorization.

20306511139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The spelling of 20306511139 in words is "twenty billion, three hundred six million, five hundred eleven thousand, one hundred thirty-nine".