20028293 has 4 divisors (see below), whose sum is σ = 20253420. Its totient is φ = 19803168.

The previous prime is 20028289. The next prime is 20028301. The reversal of 20028293 is 39282002.

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 13667809 + 6360484 = 3697^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 20028293 - 2² = 20028289 is a prime.

It is a super-2 number, since 2×20028293² = 802265040987698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028893) 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, 112430 + ... + 112607.

It is an arithmetic number, because the mean of its divisors is an integer number (5063355).

Almost surely, 2^20028293 is an apocalyptic number.

It is an amenable number.

20028293 is a deficient number, since it is larger than the sum of its proper divisors (225127).

20028293 is an equidigital number, since it uses as much as digits as its factorization.

20028293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225126.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20028293 is about 4475.2980906304. The cubic root of 20028293 is about 271.5696997120.

The spelling of 20028293 in words is "twenty million, twenty-eight thousand, two hundred ninety-three".