20028237 has 4 divisors (see below), whose sum is σ = 26704320. Its totient is φ = 13352156.

The previous prime is 20028221. The next prime is 20028257. The reversal of 20028237 is 73282002.

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 20028237 - 2⁴ = 20028221 is a prime.

It is a super-2 number, since 2×20028237² = 802260554656338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3338037 + ... + 3338042.

It is an arithmetic number, because the mean of its divisors is an integer number (6676080).

Almost surely, 2^20028237 is an apocalyptic number.

It is an amenable number.

20028237 is a deficient number, since it is larger than the sum of its proper divisors (6676083).

20028237 is an equidigital number, since it uses as much as digits as its factorization.

20028237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676082.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20028237 is about 4475.2918340595. The cubic root of 20028237 is about 271.5694466047.

The spelling of 20028237 in words is "twenty million, twenty-eight thousand, two hundred thirty-seven".