20938563 has 6 divisors (see below), whose sum is σ = 30244604. Its totient is φ = 13959036.

The previous prime is 20938553. The next prime is 20938583. The reversal of 20938563 is 36583902.

20938563 is a `hidden beast` number, since 2 + 0 + 93 + 8 + 563 = 666.

It is not a de Polignac number, because 20938563 - 2⁵ = 20938531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20938553) 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 5 ways as a sum of consecutive naturals, for example, 1163245 + ... + 1163262.

Almost surely, 2^20938563 is an apocalyptic number.

20938563 is a deficient number, since it is larger than the sum of its proper divisors (9306041).

20938563 is a wasteful number, since it uses less digits than its factorization.

20938563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326513 (or 2326510 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20938563 is about 4575.8674587448. The cubic root of 20938563 is about 275.6231071800.

The spelling of 20938563 in words is "twenty million, nine hundred thirty-eight thousand, five hundred sixty-three".