20747663 has 2 divisors, whose sum is σ = 20747664. Its totient is φ = 20747662.

The previous prime is 20747653. The next prime is 20747719. The reversal of 20747663 is 36674702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20747663 - 2⁴ = 20747647 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373831 + 10373832.

It is an arithmetic number, because the mean of its divisors is an integer number (10373832).

Almost surely, 2^20747663 is an apocalyptic number.

20747663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747663 is an equidigital number, since it uses as much as digits as its factorization.

20747663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 20747663 is about 4554.9602632734. The cubic root of 20747663 is about 274.7829162835.

The spelling of 20747663 in words is "twenty million, seven hundred forty-seven thousand, six hundred sixty-three".