20513173459 has 2 divisors, whose sum is σ = 20513173460. Its totient is φ = 20513173458.

The previous prime is 20513173451. The next prime is 20513173493. The reversal of 20513173459 is 95437131502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20513173459 - 2³ = 20513173451 is a prime.

It is not a weakly prime, because it can be changed into another prime (20513173451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256586729 + 10256586730.

It is an arithmetic number, because the mean of its divisors is an integer number (10256586730).

Almost surely, 2^20513173459 is an apocalyptic number.

20513173459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513173459 is an equidigital number, since it uses as much as digits as its factorization.

20513173459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 20513173459 in words is "twenty billion, five hundred thirteen million, one hundred seventy-three thousand, four hundred fifty-nine".