20032221 has 8 divisors (see below), whose sum is σ = 29137824. Its totient is φ = 12140720.

The previous prime is 20032193. The next prime is 20032237. The reversal of 20032221 is 12223002.

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 20032221 - 2¹¹ = 20030173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20032197 and 20032206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032261) 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, 303486 + ... + 303551.

It is an arithmetic number, because the mean of its divisors is an integer number (3642228).

Almost surely, 2^20032221 is an apocalyptic number.

It is an amenable number.

20032221 is a deficient number, since it is larger than the sum of its proper divisors (9105603).

20032221 is a wasteful number, since it uses less digits than its factorization.

20032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607051.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20032221 is about 4475.7369225637. The cubic root of 20032221 is about 271.5874521993.

Adding to 20032221 its reverse (12223002), we get a palindrome (32255223).

It can be divided in two parts, 2003 and 2221, that added together give a palindrome (4224).

The spelling of 20032221 in words is "twenty million, thirty-two thousand, two hundred twenty-one".