20303243 has 4 divisors (see below), whose sum is σ = 20312520. Its totient is φ = 20293968.

The previous prime is 20303203. The next prime is 20303249. The reversal of 20303243 is 34230302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20303243 - 2¹⁴ = 20286859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20303249) 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, 671 + ... + 6407.

It is an arithmetic number, because the mean of its divisors is an integer number (5078130).

Almost surely, 2^20303243 is an apocalyptic number.

20303243 is a deficient number, since it is larger than the sum of its proper divisors (9277).

20303243 is an equidigital number, since it uses as much as digits as its factorization.

20303243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9276.

The product of its (nonzero) digits is 432, while the sum is 17.

The square root of 20303243 is about 4505.9120053547. The cubic root of 20303243 is about 272.8067661640.

Adding to 20303243 its reverse (34230302), we get a palindrome (54533545).

The spelling of 20303243 in words is "twenty million, three hundred three thousand, two hundred forty-three".