20517047753 has 2 divisors, whose sum is σ = 20517047754. Its totient is φ = 20517047752.

The previous prime is 20517047693. The next prime is 20517047773. The reversal of 20517047753 is 35774071502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16274870329 + 4242177424 = 127573^2 + 65132^2 .

It is a cyclic number.

It is not a de Polignac number, because 20517047753 - 2⁸ = 20517047497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20517047753.

It is not a weakly prime, because it can be changed into another prime (20517047773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258523876 + 10258523877.

It is an arithmetic number, because the mean of its divisors is an integer number (10258523877).

Almost surely, 2^20517047753 is an apocalyptic number.

It is an amenable number.

20517047753 is a deficient number, since it is larger than the sum of its proper divisors (1).

20517047753 is an equidigital number, since it uses as much as digits as its factorization.

20517047753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 205800, while the sum is 41.

The spelling of 20517047753 in words is "twenty billion, five hundred seventeen million, forty-seven thousand, seven hundred fifty-three".