20043545 has 4 divisors (see below), whose sum is σ = 24052260. Its totient is φ = 16034832.

The previous prime is 20043469. The next prime is 20043559. The reversal of 20043545 is 54534002.

20043545 is nontrivially palindromic in base 2.

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 7198489 + 12845056 = 2683^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043545 - 2¹⁰ = 20042521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20043545.

It is an unprimeable number.

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, 2004350 + ... + 2004359.

It is an arithmetic number, because the mean of its divisors is an integer number (6013065).

Almost surely, 2^20043545 is an apocalyptic number.

It is an amenable number.

20043545 is a deficient number, since it is larger than the sum of its proper divisors (4008715).

20043545 is an equidigital number, since it uses as much as digits as its factorization.

20043545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008714.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20043545 is about 4477.0017869105. The cubic root of 20043545 is about 271.6386177188.

Adding to 20043545 its reverse (54534002), we get a palindrome (74577547).

The spelling of 20043545 in words is "twenty million, forty-three thousand, five hundred forty-five".