20773663 has 2 divisors, whose sum is σ = 20773664. Its totient is φ = 20773662.

The previous prime is 20773661. The next prime is 20773679. The reversal of 20773663 is 36637702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20773663 - 2¹ = 20773661 is a prime.

Together with 20773661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20773661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386831 + 10386832.

It is an arithmetic number, because the mean of its divisors is an integer number (10386832).

Almost surely, 2^20773663 is an apocalyptic number.

20773663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773663 is an equidigital number, since it uses as much as digits as its factorization.

20773663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 20773663 is about 4557.8134011826. The cubic root of 20773663 is about 274.8976500662.

The spelling of 20773663 in words is "twenty million, seven hundred seventy-three thousand, six hundred sixty-three".