20605763 has 2 divisors, whose sum is σ = 20605764. Its totient is φ = 20605762.

The previous prime is 20605757. The next prime is 20605771. The reversal of 20605763 is 36750602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20605763 - 2⁶ = 20605699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20605703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302881 + 10302882.

It is an arithmetic number, because the mean of its divisors is an integer number (10302882).

Almost surely, 2^20605763 is an apocalyptic number.

20605763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20605763 is an equidigital number, since it uses as much as digits as its factorization.

20605763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20605763 is about 4539.3571130723. The cubic root of 20605763 is about 274.1550395051.

The spelling of 20605763 in words is "twenty million, six hundred five thousand, seven hundred sixty-three".