20634863 has 8 divisors (see below), whose sum is σ = 21924480. Its totient is φ = 19383840.

The previous prime is 20634857. The next prime is 20634877. The reversal of 20634863 is 36843602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20634863 - 2⁶ = 20634799 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 (20634763) 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 in 7 ways as a sum of consecutive naturals, for example, 8543 + ... + 10688.

It is an arithmetic number, because the mean of its divisors is an integer number (2740560).

Almost surely, 2^20634863 is an apocalyptic number.

20634863 is a deficient number, since it is larger than the sum of its proper divisors (1289617).

20634863 is a wasteful number, since it uses less digits than its factorization.

20634863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19297.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20634863 is about 4542.5612819201. The cubic root of 20634863 is about 274.2840351176.

The spelling of 20634863 in words is "twenty million, six hundred thirty-four thousand, eight hundred sixty-three".