20330231 has 4 divisors (see below), whose sum is σ = 20436864. Its totient is φ = 20223600.

The previous prime is 20330207. The next prime is 20330237. The reversal of 20330231 is 13203302.

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-20330231 is a prime.

It is a super-2 number, since 2×20330231² = 826636585026722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330237) 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, 53030 + ... + 53411.

It is an arithmetic number, because the mean of its divisors is an integer number (5109216).

Almost surely, 2^20330231 is an apocalyptic number.

20330231 is a deficient number, since it is larger than the sum of its proper divisors (106633).

20330231 is a wasteful number, since it uses less digits than its factorization.

20330231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106632.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20330231 is about 4508.9057430822. The cubic root of 20330231 is about 272.9275883929.

Adding to 20330231 its reverse (13203302), we get a palindrome (33533533).

The spelling of 20330231 in words is "twenty million, three hundred thirty thousand, two hundred thirty-one".