20513174089 has 2 divisors, whose sum is σ = 20513174090. Its totient is φ = 20513174088.

The previous prime is 20513174063. The next prime is 20513174119. The reversal of 20513174089 is 98047131502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19800711225 + 712462864 = 140715^2 + 26692^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513174089 - 2⁵ = 20513174057 is a prime.

It is a super-2 number, since 2×20513174089² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20513174009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256587044 + 10256587045.

It is an arithmetic number, because the mean of its divisors is an integer number (10256587045).

Almost surely, 2^20513174089 is an apocalyptic number.

It is an amenable number.

20513174089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513174089 is an equidigital number, since it uses as much as digits as its factorization.

20513174089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 20513174089 in words is "twenty billion, five hundred thirteen million, one hundred seventy-four thousand, eighty-nine".