20033421 has 12 divisors (see below), whose sum is σ = 27300672. Its totient is φ = 13067128.

The previous prime is 20033413. The next prime is 20033423. The reversal of 20033421 is 12433002.

It is not a de Polignac number, because 20033421 - 2³ = 20033413 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20033421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20033423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5116 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (2275056).

Almost surely, 2^20033421 is an apocalyptic number.

It is an amenable number.

20033421 is a deficient number, since it is larger than the sum of its proper divisors (7267251).

20033421 is an equidigital number, since it uses as much as digits as its factorization.

20033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120 (or 3073 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20033421 is about 4475.8709766927. The cubic root of 20033421 is about 271.5928751033.

Adding to 20033421 its reverse (12433002), we get a palindrome (32466423).

The spelling of 20033421 in words is "twenty million, thirty-three thousand, four hundred twenty-one".