20630663 has 4 divisors (see below), whose sum is σ = 20659320. Its totient is φ = 20602008.

The previous prime is 20630647. The next prime is 20630681. The reversal of 20630663 is 36603602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20630663 - 2⁴ = 20630647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630063) 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 in 3 ways as a sum of consecutive naturals, for example, 13220 + ... + 14697.

It is an arithmetic number, because the mean of its divisors is an integer number (5164830).

Almost surely, 2^20630663 is an apocalyptic number.

20630663 is a deficient number, since it is larger than the sum of its proper divisors (28657).

20630663 is an equidigital number, since it uses as much as digits as its factorization.

20630663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28656.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 20630663 is about 4542.0989641354. The cubic root of 20630663 is about 274.2654246860.

The spelling of 20630663 in words is "twenty million, six hundred thirty thousand, six hundred sixty-three".