20639063 has 8 divisors (see below), whose sum is σ = 21220032. Its totient is φ = 20064096.

The previous prime is 20639057. The next prime is 20639077. The reversal of 20639063 is 36093602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20639063 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 (20639023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5981 + ... + 8777.

It is an arithmetic number, because the mean of its divisors is an integer number (2652504).

Almost surely, 2^20639063 is an apocalyptic number.

20639063 is a deficient number, since it is larger than the sum of its proper divisors (580969).

20639063 is a wasteful number, since it uses less digits than its factorization.

20639063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20639063 is about 4543.0235526574. The cubic root of 20639063 is about 274.3026430240.

The spelling of 20639063 in words is "twenty million, six hundred thirty-nine thousand, sixty-three".