20850503777 has 2 divisors, whose sum is σ = 20850503778. Its totient is φ = 20850503776.

The previous prime is 20850503671. The next prime is 20850503801. The reversal of 20850503777 is 77730505802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20461585936 + 388917841 = 143044^2 + 19721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20850503777 is a prime.

It is not a weakly prime, because it can be changed into another prime (20850509777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10425251888 + 10425251889.

It is an arithmetic number, because the mean of its divisors is an integer number (10425251889).

Almost surely, 2^20850503777 is an apocalyptic number.

It is an amenable number.

20850503777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20850503777 is an equidigital number, since it uses as much as digits as its factorization.

20850503777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 20850503777 in words is "twenty billion, eight hundred fifty million, five hundred three thousand, seven hundred seventy-seven".