20432321 has 16 divisors (see below), whose sum is σ = 25382784. Its totient is φ = 16015104.

The previous prime is 20432297. The next prime is 20432329. The reversal of 20432321 is 12323402.

It is a de Polignac number, because none of the positive numbers 2^k-20432321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20432321.

It is not an unprimeable number, because it can be changed into a prime (20432329) 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 15 ways as a sum of consecutive naturals, for example, 9290 + ... + 11276.

It is an arithmetic number, because the mean of its divisors is an integer number (1586424).

Almost surely, 2^20432321 is an apocalyptic number.

It is an amenable number.

20432321 is a deficient number, since it is larger than the sum of its proper divisors (4950463).

20432321 is a wasteful number, since it uses less digits than its factorization.

20432321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20432321 is about 4520.2124950051. The cubic root of 20432321 is about 273.3836689307.

Adding to 20432321 its reverse (12323402), we get a palindrome (32755723).

The spelling of 20432321 in words is "twenty million, four hundred thirty-two thousand, three hundred twenty-one".