20430543 has 16 divisors (see below), whose sum is σ = 31243520. Its totient is φ = 11632896.

The previous prime is 20430541. The next prime is 20430551. The reversal of 20430543 is 34503402.

It is a happy number.

It is not a de Polignac number, because 20430543 - 2¹ = 20430541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4863 + ... + 8031.

It is an arithmetic number, because the mean of its divisors is an integer number (1952720).

Almost surely, 2^20430543 is an apocalyptic number.

20430543 is a deficient number, since it is larger than the sum of its proper divisors (10812977).

20430543 is a wasteful number, since it uses less digits than its factorization.

20430543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20430543 is about 4520.0158185564. The cubic root of 20430543 is about 273.3757388435.

Adding to 20430543 its reverse (34503402), we get a palindrome (54933945).

The spelling of 20430543 in words is "twenty million, four hundred thirty thousand, five hundred forty-three".