20033021 has 8 divisors (see below), whose sum is σ = 21785400. Its totient is φ = 18344448.

The previous prime is 20033009. The next prime is 20033029. The reversal of 20033021 is 12033002.

It can be written as a sum of positive squares in 4 ways, for example, as 9703225 + 10329796 = 3115^2 + 3214^2 .

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 20033021 - 2¹⁰ = 20031997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20032993 and 20033011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20033029) 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, 15296 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (2723175).

Almost surely, 2^20033021 is an apocalyptic number.

It is an amenable number.

20033021 is a deficient number, since it is larger than the sum of its proper divisors (1752379).

20033021 is a wasteful number, since it uses less digits than its factorization.

20033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31903.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20033021 is about 4475.8262924291. The cubic root of 20033021 is about 271.5910674927.

Adding to 20033021 its reverse (12033002), we get a palindrome (32066023).

The spelling of 20033021 in words is "twenty million, thirty-three thousand, twenty-one".