20638063 has 4 divisors (see below), whose sum is σ = 20651400. Its totient is φ = 20624728.

The previous prime is 20638043. The next prime is 20638081. The reversal of 20638063 is 36083602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36083602 = 2 ⋅18041801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20638063 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 (20638003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3988 + ... + 7561.

It is an arithmetic number, because the mean of its divisors is an integer number (5162850).

Almost surely, 2^20638063 is an apocalyptic number.

20638063 is a deficient number, since it is larger than the sum of its proper divisors (13337).

20638063 is a wasteful number, since it uses less digits than its factorization.

20638063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20638063 is about 4542.9134924627. The cubic root of 20638063 is about 274.2982127990.

The spelling of 20638063 in words is "twenty million, six hundred thirty-eight thousand, sixty-three".