20303393 has 8 divisors (see below), whose sum is σ = 22913280. Its totient is φ = 17820880.

The previous prime is 20303351. The next prime is 20303431. The reversal of 20303393 is 39330302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20303393 - 2⁶ = 20303329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20303993) 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, 31505 + ... + 32142.

It is an arithmetic number, because the mean of its divisors is an integer number (2864160).

Almost surely, 2^20303393 is an apocalyptic number.

It is an amenable number.

20303393 is a deficient number, since it is larger than the sum of its proper divisors (2609887).

20303393 is a wasteful number, since it uses less digits than its factorization.

20303393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63687.

The product of its (nonzero) digits is 1458, while the sum is 23.

The square root of 20303393 is about 4505.9286501231. The cubic root of 20303393 is about 272.8074379929.

Adding to 20303393 its reverse (39330302), we get a palindrome (59633695).

The spelling of 20303393 in words is "twenty million, three hundred three thousand, three hundred ninety-three".