20505593 has 2 divisors, whose sum is σ = 20505594. Its totient is φ = 20505592.

The previous prime is 20505571. The next prime is 20505599. The reversal of 20505593 is 39550502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20502784 + 2809 = 4528^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 20505593 - 2²² = 16311289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20505599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252796 + 10252797.

It is an arithmetic number, because the mean of its divisors is an integer number (10252797).

Almost surely, 2^20505593 is an apocalyptic number.

It is an amenable number.

20505593 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505593 is an equidigital number, since it uses as much as digits as its factorization.

20505593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 20505593 is about 4528.3101704720. The cubic root of 20505593 is about 273.7100712529.

The spelling of 20505593 in words is "twenty million, five hundred five thousand, five hundred ninety-three".