20398303 has 4 divisors (see below), whose sum is σ = 20512440. Its totient is φ = 20284168.

The previous prime is 20398291. The next prime is 20398307. The reversal of 20398303 is 30389302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20398303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20398307) 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, 56800 + ... + 57157.

It is an arithmetic number, because the mean of its divisors is an integer number (5128110).

Almost surely, 2^20398303 is an apocalyptic number.

20398303 is a deficient number, since it is larger than the sum of its proper divisors (114137).

20398303 is a wasteful number, since it uses less digits than its factorization.

20398303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114136.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20398303 is about 4516.4480512899. The cubic root of 20398303 is about 273.2318648089.

Subtracting 20398303 from its reverse (30389302), we obtain a palindrome (9990999).

The spelling of 20398303 in words is "twenty million, three hundred ninety-eight thousand, three hundred three".