20503155539 has 2 divisors, whose sum is σ = 20503155540. Its totient is φ = 20503155538.

The previous prime is 20503155511. The next prime is 20503155551. The reversal of 20503155539 is 93555130502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20503155539 is a prime.

It is not a weakly prime, because it can be changed into another prime (20503155559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251577769 + 10251577770.

It is an arithmetic number, because the mean of its divisors is an integer number (10251577770).

Almost surely, 2^20503155539 is an apocalyptic number.

20503155539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503155539 is an equidigital number, since it uses as much as digits as its factorization.

20503155539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 101250, while the sum is 38.

The spelling of 20503155539 in words is "twenty billion, five hundred three million, one hundred fifty-five thousand, five hundred thirty-nine".