20113543 has 4 divisors (see below), whose sum is σ = 20134048. Its totient is φ = 20093040.

The previous prime is 20113537. The next prime is 20113547. The reversal of 20113543 is 34531102.

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

It is a cyclic number.

It is not a de Polignac number, because 20113543 - 2⁹ = 20113031 is a prime.

It is a super-2 number, since 2×20113543² = 809109224025698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20113543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113547) 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, 8703 + ... + 10768.

It is an arithmetic number, because the mean of its divisors is an integer number (5033512).

Almost surely, 2^20113543 is an apocalyptic number.

20113543 is a deficient number, since it is larger than the sum of its proper divisors (20505).

20113543 is a wasteful number, since it uses less digits than its factorization.

20113543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20504.

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

The square root of 20113543 is about 4484.8124821446. The cubic root of 20113543 is about 271.9544645155.

Adding to 20113543 its reverse (34531102), we get a palindrome (54644645).

The spelling of 20113543 in words is "twenty million, one hundred thirteen thousand, five hundred forty-three".