20432409 has 4 divisors (see below), whose sum is σ = 27243216. Its totient is φ = 13621604.

The previous prime is 20432407. The next prime is 20432437. The reversal of 20432409 is 90423402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20432409 - 2¹ = 20432407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20432407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405399 + ... + 3405404.

It is an arithmetic number, because the mean of its divisors is an integer number (6810804).

Almost surely, 2^20432409 is an apocalyptic number.

It is an amenable number.

20432409 is a deficient number, since it is larger than the sum of its proper divisors (6810807).

20432409 is an equidigital number, since it uses as much as digits as its factorization.

20432409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810806.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20432409 is about 4520.2222290502. Note that the first 5 decimals coincide. The cubic root of 20432409 is about 273.3840614090.

The spelling of 20432409 in words is "twenty million, four hundred thirty-two thousand, four hundred nine".