20543113 has 4 divisors (see below), whose sum is σ = 20649748. Its totient is φ = 20436480.

The previous prime is 20543093. The next prime is 20543119. The reversal of 20543113 is 31134502.

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 1776889 + 18766224 = 1333^2 + 4332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20543113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53028 + ... + 53413.

It is an arithmetic number, because the mean of its divisors is an integer number (5162437).

Almost surely, 2^20543113 is an apocalyptic number.

It is an amenable number.

20543113 is a deficient number, since it is larger than the sum of its proper divisors (106635).

20543113 is a wasteful number, since it uses less digits than its factorization.

20543113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106634.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20543113 is about 4532.4511028802. The cubic root of 20543113 is about 273.8769093874.

Adding to 20543113 its reverse (31134502), we get a palindrome (51677615).

The spelling of 20543113 in words is "twenty million, five hundred forty-three thousand, one hundred thirteen".