20513174057 has 2 divisors, whose sum is σ = 20513174058. Its totient is φ = 20513174056.

The previous prime is 20513174051. The next prime is 20513174063. The reversal of 20513174057 is 75047131502.

It is a balanced prime because it is at equal distance from previous prime (20513174051) and next prime (20513174063).

It can be written as a sum of positive squares in only one way, i.e., 12030579856 + 8482594201 = 109684^2 + 92101^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513174057 - 2²⁴ = 20496396841 is a prime.

It is not a weakly prime, because it can be changed into another prime (20513174051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256587028 + 10256587029.

It is an arithmetic number, because the mean of its divisors is an integer number (10256587029).

Almost surely, 2^20513174057 is an apocalyptic number.

It is an amenable number.

20513174057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513174057 is an equidigital number, since it uses as much as digits as its factorization.

20513174057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 35.

The spelling of 20513174057 in words is "twenty billion, five hundred thirteen million, one hundred seventy-four thousand, fifty-seven".