20233021 has 4 divisors (see below), whose sum is σ = 20320092. Its totient is φ = 20145952.

The previous prime is 20233019. The next prime is 20233033. The reversal of 20233021 is 12033202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9922500 + 10310521 = 3150^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 20233021 - 2¹ = 20233019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20232992 and 20233010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233051) 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, 43186 + ... + 43651.

It is an arithmetic number, because the mean of its divisors is an integer number (5080023).

Almost surely, 2^20233021 is an apocalyptic number.

It is an amenable number.

20233021 is a deficient number, since it is larger than the sum of its proper divisors (87071).

20233021 is an equidigital number, since it uses as much as digits as its factorization.

20233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87070.

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

The square root of 20233021 is about 4498.1130488239. The cubic root of 20233021 is about 272.4918876467.

Adding to 20233021 its reverse (12033202), we get a palindrome (32266223).

The spelling of 20233021 in words is "twenty million, two hundred thirty-three thousand, twenty-one".