20503505783 has 2 divisors, whose sum is σ = 20503505784. Its totient is φ = 20503505782.

The previous prime is 20503505767. The next prime is 20503505791. The reversal of 20503505783 is 38750530502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20503505783 - 2⁴ = 20503505767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503501783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251752891 + 10251752892.

It is an arithmetic number, because the mean of its divisors is an integer number (10251752892).

Almost surely, 2^20503505783 is an apocalyptic number.

20503505783 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503505783 is an equidigital number, since it uses as much as digits as its factorization.

20503505783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 20503505783 in words is "twenty billion, five hundred three million, five hundred five thousand, seven hundred eighty-three".