20430565 has 8 divisors (see below), whose sum is σ = 24755328. Its totient is φ = 16185360.

The previous prime is 20430563. The next prime is 20430577. The reversal of 20430565 is 56503402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20430565 - 2¹ = 20430563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19321 + ... + 20350.

It is an arithmetic number, because the mean of its divisors is an integer number (3094416).

Almost surely, 2^20430565 is an apocalyptic number.

It is an amenable number.

20430565 is a deficient number, since it is larger than the sum of its proper divisors (4324763).

20430565 is a wasteful number, since it uses less digits than its factorization.

20430565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39779.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20430565 is about 4520.0182521755. The cubic root of 20430565 is about 273.3758369689.

Adding to 20430565 its reverse (56503402), we get a palindrome (76933967).

The spelling of 20430565 in words is "twenty million, four hundred thirty thousand, five hundred sixty-five".