20548940777 has 2 divisors, whose sum is σ = 20548940778. Its totient is φ = 20548940776.

The previous prime is 20548940693. The next prime is 20548940827. The reversal of 20548940777 is 77704984502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20511681961 + 37258816 = 143219^2 + 6104^2 .

It is a cyclic number.

It is not a de Polignac number, because 20548940777 - 2¹⁰ = 20548939753 is a prime.

It is not a weakly prime, because it can be changed into another prime (20548940977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10274470388 + 10274470389.

It is an arithmetic number, because the mean of its divisors is an integer number (10274470389).

Almost surely, 2^20548940777 is an apocalyptic number.

It is an amenable number.

20548940777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20548940777 is an equidigital number, since it uses as much as digits as its factorization.

20548940777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 20548940777 in words is "twenty billion, five hundred forty-eight million, nine hundred forty thousand, seven hundred seventy-seven".