20936593 has 4 divisors (see below), whose sum is σ = 21143988. Its totient is φ = 20729200.

The previous prime is 20936581. The next prime is 20936677. The reversal of 20936593 is 39563902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16908544 + 4028049 = 4112^2 + 2007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20936593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20936893) 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, 103546 + ... + 103747.

It is an arithmetic number, because the mean of its divisors is an integer number (5285997).

Almost surely, 2^20936593 is an apocalyptic number.

It is an amenable number.

20936593 is a deficient number, since it is larger than the sum of its proper divisors (207395).

20936593 is a wasteful number, since it uses less digits than its factorization.

20936593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207394.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 20936593 is about 4575.6521939501. The cubic root of 20936593 is about 275.6144629295.

The spelling of 20936593 in words is "twenty million, nine hundred thirty-six thousand, five hundred ninety-three".