20503505677 has 2 divisors, whose sum is σ = 20503505678. Its totient is φ = 20503505676.

The previous prime is 20503505669. The next prime is 20503505761. The reversal of 20503505677 is 77650530502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16701426756 + 3802078921 = 129234^2 + 61661^2 .

It is a cyclic number.

It is not a de Polignac number, because 20503505677 - 2³ = 20503505669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20503503677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251752838 + 10251752839.

It is an arithmetic number, because the mean of its divisors is an integer number (10251752839).

Almost surely, 2^20503505677 is an apocalyptic number.

It is an amenable number.

20503505677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503505677 is an equidigital number, since it uses as much as digits as its factorization.

20503505677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 220500, while the sum is 40.

The spelling of 20503505677 in words is "twenty billion, five hundred three million, five hundred five thousand, six hundred seventy-seven".