20475009563 has 2 divisors, whose sum is σ = 20475009564. Its totient is φ = 20475009562.

The previous prime is 20475009523. The next prime is 20475009587. The reversal of 20475009563 is 36590057402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20475009563 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20475009563.

It is not a weakly prime, because it can be changed into another prime (20475009523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10237504781 + 10237504782.

It is an arithmetic number, because the mean of its divisors is an integer number (10237504782).

Almost surely, 2^20475009563 is an apocalyptic number.

20475009563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20475009563 is an equidigital number, since it uses as much as digits as its factorization.

20475009563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 20475009563 in words is "twenty billion, four hundred seventy-five million, nine thousand, five hundred sixty-three".