20430433 has 4 divisors (see below), whose sum is σ = 20567700. Its totient is φ = 20293168.

The previous prime is 20430409. The next prime is 20430439. The reversal of 20430433 is 33403402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4613904 + 15816529 = 2148^2 + 3977^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430433 - 2¹⁷ = 20299361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20430433.

It is not an unprimeable number, because it can be changed into a prime (20430439) 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, 68410 + ... + 68707.

It is an arithmetic number, because the mean of its divisors is an integer number (5141925).

Almost surely, 2^20430433 is an apocalyptic number.

It is an amenable number.

20430433 is a deficient number, since it is larger than the sum of its proper divisors (137267).

20430433 is a wasteful number, since it uses less digits than its factorization.

20430433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137266.

The product of its (nonzero) digits is 864, while the sum is 19.

The square root of 20430433 is about 4520.0036504410. The cubic root of 20430433 is about 273.3752482155.

Adding to 20430433 its reverse (33403402), we get a palindrome (53833835).

The spelling of 20430433 in words is "twenty million, four hundred thirty thousand, four hundred thirty-three".