20576993 has 2 divisors, whose sum is σ = 20576994. Its totient is φ = 20576992.

The previous prime is 20576971. The next prime is 20576999. The reversal of 20576993 is 39967502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14386849 + 6190144 = 3793^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 20576993 - 2⁸ = 20576737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20576993.

It is not a weakly prime, because it can be changed into another prime (20576999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288496 + 10288497.

It is an arithmetic number, because the mean of its divisors is an integer number (10288497).

Almost surely, 2^20576993 is an apocalyptic number.

It is an amenable number.

20576993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20576993 is an equidigital number, since it uses as much as digits as its factorization.

20576993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 20576993 is about 4536.1870552260. The cubic root of 20576993 is about 274.0273872850.

The spelling of 20576993 in words is "twenty million, five hundred seventy-six thousand, nine hundred ninety-three".