20302231 has 4 divisors (see below), whose sum is σ = 20488600. Its totient is φ = 20115864.

The previous prime is 20302223. The next prime is 20302259. The reversal of 20302231 is 13220302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13220302 = 2 ⋅6610151.

It is a cyclic number.

It is not a de Polignac number, because 20302231 - 2³ = 20302223 is a prime.

It is a super-2 number, since 2×20302231² = 824361167154722, 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 (20302211) 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, 93021 + ... + 93238.

It is an arithmetic number, because the mean of its divisors is an integer number (5122150).

Almost surely, 2^20302231 is an apocalyptic number.

20302231 is a deficient number, since it is larger than the sum of its proper divisors (186369).

20302231 is a wasteful number, since it uses less digits than its factorization.

20302231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186368.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20302231 is about 4505.7997070442. The cubic root of 20302231 is about 272.8022334721.

Adding to 20302231 its reverse (13220302), we get a palindrome (33522533).

The spelling of 20302231 in words is "twenty million, three hundred two thousand, two hundred thirty-one".