20432221 has 8 divisors (see below), whose sum is σ = 20691000. Its totient is φ = 20175360.

The previous prime is 20432183. The next prime is 20432233. The reversal of 20432221 is 12223402.

It can be written as a sum of positive squares in 4 ways, for example, as 308025 + 20124196 = 555^2 + 4486^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20432221 - 2¹¹ = 20430173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20432195 and 20432204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432261) 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, 35625 + ... + 36193.

It is an arithmetic number, because the mean of its divisors is an integer number (2586375).

Almost surely, 2^20432221 is an apocalyptic number.

It is an amenable number.

20432221 is a deficient number, since it is larger than the sum of its proper divisors (258779).

20432221 is a wasteful number, since it uses less digits than its factorization.

20432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20432221 is about 4520.2014335647. The cubic root of 20432221 is about 273.3832229313.

Adding to 20432221 its reverse (12223402), we get a palindrome (32655623).

The spelling of 20432221 in words is "twenty million, four hundred thirty-two thousand, two hundred twenty-one".