20545043 has 4 divisors (see below), whose sum is σ = 20651688. Its totient is φ = 20438400.

The previous prime is 20545037. The next prime is 20545051. The reversal of 20545043 is 34054502.

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 20545043 - 2⁸ = 20544787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545243) 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, 53033 + ... + 53418.

It is an arithmetic number, because the mean of its divisors is an integer number (5162922).

Almost surely, 2^20545043 is an apocalyptic number.

20545043 is a deficient number, since it is larger than the sum of its proper divisors (106645).

20545043 is a wasteful number, since it uses less digits than its factorization.

20545043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106644.

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

The square root of 20545043 is about 4532.6640069610. The cubic root of 20545043 is about 273.8854859175.

Adding to 20545043 its reverse (34054502), we get a palindrome (54599545).

The spelling of 20545043 in words is "twenty million, five hundred forty-five thousand, forty-three".