20472005789 has 2 divisors, whose sum is σ = 20472005790. Its totient is φ = 20472005788.

The previous prime is 20472005783. The next prime is 20472005819. The reversal of 20472005789 is 98750027402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20375278564 + 96727225 = 142742^2 + 9835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20472005789 - 2¹⁶ = 20471940253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20472005783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236002894 + 10236002895.

It is an arithmetic number, because the mean of its divisors is an integer number (10236002895).

Almost surely, 2^20472005789 is an apocalyptic number.

It is an amenable number.

20472005789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20472005789 is an equidigital number, since it uses as much as digits as its factorization.

20472005789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 20472005789 in words is "twenty billion, four hundred seventy-two million, five thousand, seven hundred eighty-nine".