20332021 has 4 divisors (see below), whose sum is σ = 20635552. Its totient is φ = 20028492.

The previous prime is 20331989. The next prime is 20332043. The reversal of 20332021 is 12023302.

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 20332021 - 2⁵ = 20331989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331992 and 20332010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312021) 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, 151665 + ... + 151798.

It is an arithmetic number, because the mean of its divisors is an integer number (5158888).

Almost surely, 2^20332021 is an apocalyptic number.

It is an amenable number.

20332021 is a deficient number, since it is larger than the sum of its proper divisors (303531).

20332021 is an equidigital number, since it uses as much as digits as its factorization.

20332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303530.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20332021 is about 4509.1042347677. The cubic root of 20332021 is about 272.9355982387.

Adding to 20332021 its reverse (12023302), we get a palindrome (32355323).

The spelling of 20332021 in words is "twenty million, three hundred thirty-two thousand, twenty-one".