20430505 has 8 divisors (see below), whose sum is σ = 25114824. Its totient is φ = 15945600.

The previous prime is 20430503. The next prime is 20430517. The reversal of 20430505 is 50503402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 72361 + 20358144 = 269^2 + 4512^2 .

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

It is not a de Polignac number, because 20430505 - 2¹ = 20430503 is a prime.

It is a super-3 number, since 3×20430505³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49626 + ... + 50035.

It is an arithmetic number, because the mean of its divisors is an integer number (3139353).

Almost surely, 2^20430505 is an apocalyptic number.

It is an amenable number.

20430505 is a deficient number, since it is larger than the sum of its proper divisors (4684319).

20430505 is an equidigital number, since it uses as much as digits as its factorization.

20430505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99707.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20430505 is about 4520.0116150293. The cubic root of 20430505 is about 273.3755693540.

Adding to 20430505 its reverse (50503402), we get a palindrome (70933907).

The spelling of 20430505 in words is "twenty million, four hundred thirty thousand, five hundred five".