20545443 has 12 divisors (see below), whose sum is σ = 30367480. Its totient is φ = 13378176.

The previous prime is 20545433. The next prime is 20545477. The reversal of 20545443 is 34454502.

20545443 is a `hidden beast` number, since 205 + 454 + 4 + 3 = 666.

It is not a de Polignac number, because 20545443 - 2⁵ = 20545411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26158 + ... + 26931.

Almost surely, 2^20545443 is an apocalyptic number.

20545443 is a deficient number, since it is larger than the sum of its proper divisors (9822037).

20545443 is a wasteful number, since it uses less digits than its factorization.

20545443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53138 (or 53135 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 20545443 is about 4532.7081309081. The cubic root of 20545443 is about 273.8872633695.

Adding to 20545443 its reverse (34454502), we get a palindrome (54999945).

The spelling of 20545443 in words is "twenty million, five hundred forty-five thousand, four hundred forty-three".