20677495057 has 2 divisors, whose sum is σ = 20677495058. Its totient is φ = 20677495056.

The previous prime is 20677495031. The next prime is 20677495079. The reversal of 20677495057 is 75059477602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11193851601 + 9483643456 = 105801^2 + 97384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20677495057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20677494995 and 20677495013.

It is not a weakly prime, because it can be changed into another prime (20677495087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10338747528 + 10338747529.

It is an arithmetic number, because the mean of its divisors is an integer number (10338747529).

Almost surely, 2^20677495057 is an apocalyptic number.

It is an amenable number.

20677495057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20677495057 is an equidigital number, since it uses as much as digits as its factorization.

20677495057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 20677495057 in words is "twenty billion, six hundred seventy-seven million, four hundred ninety-five thousand, fifty-seven".