20840063 has 2 divisors, whose sum is σ = 20840064. Its totient is φ = 20840062.

The previous prime is 20840059. The next prime is 20840087. The reversal of 20840063 is 36004802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20840063 - 2² = 20840059 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20840033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420031 + 10420032.

It is an arithmetic number, because the mean of its divisors is an integer number (10420032).

Almost surely, 2^20840063 is an apocalyptic number.

20840063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840063 is an equidigital number, since it uses as much as digits as its factorization.

20840063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20840063 is about 4565.0917844004. The cubic root of 20840063 is about 275.1902287113.

Adding to 20840063 its reverse (36004802), we get a palindrome (56844865).

The spelling of 20840063 in words is "twenty million, eight hundred forty thousand, sixty-three".