20705593 has 2 divisors, whose sum is σ = 20705594. Its totient is φ = 20705592.

The previous prime is 20705557. The next prime is 20705621. The reversal of 20705593 is 39550702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 4359744 = 4043^2 + 2088^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705593 - 2⁹ = 20705081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352796 + 10352797.

It is an arithmetic number, because the mean of its divisors is an integer number (10352797).

Almost surely, 2^20705593 is an apocalyptic number.

It is an amenable number.

20705593 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705593 is an equidigital number, since it uses as much as digits as its factorization.

20705593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 20705593 is about 4550.3398774158. The cubic root of 20705593 is about 274.5970649971.

The spelling of 20705593 in words is "twenty million, seven hundred five thousand, five hundred ninety-three".