20020393 has 4 divisors (see below), whose sum is σ = 20033748. Its totient is φ = 20007040.

The previous prime is 20020387. The next prime is 20020421. The reversal of 20020393 is 39302002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39302002 = 2 ⋅19651001.

It can be written as a sum of positive squares in 2 ways, for example, as 14197824 + 5822569 = 3768^2 + 2413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020393 is a prime.

It is a super-2 number, since 2×20020393² = 801632271748898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20020393.

It is not an unprimeable number, because it can be changed into a prime (20020303) 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, 4096 + ... + 7537.

It is an arithmetic number, because the mean of its divisors is an integer number (5008437).

Almost surely, 2^20020393 is an apocalyptic number.

It is an amenable number.

20020393 is a deficient number, since it is larger than the sum of its proper divisors (13355).

20020393 is a wasteful number, since it uses less digits than its factorization.

20020393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 20020393 is about 4474.4153808067. The cubic root of 20020393 is about 271.5339888509.

Adding to 20020393 its reverse (39302002), we get a palindrome (59322395).

The spelling of 20020393 in words is "twenty million, twenty thousand, three hundred ninety-three".