20206231 has 4 divisors (see below), whose sum is σ = 20402512. Its totient is φ = 20009952.

The previous prime is 20206223. The next prime is 20206247. The reversal of 20206231 is 13260202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13260202 = 2 ⋅6630101.

It is a cyclic number.

It is not a de Polignac number, because 20206231 - 2³ = 20206223 is a prime.

It is a super-2 number, since 2×20206231² = 816583542450722, 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 (20206211) 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, 97986 + ... + 98191.

It is an arithmetic number, because the mean of its divisors is an integer number (5100628).

Almost surely, 2^20206231 is an apocalyptic number.

20206231 is a deficient number, since it is larger than the sum of its proper divisors (196281).

20206231 is a wasteful number, since it uses less digits than its factorization.

20206231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196280.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20206231 is about 4495.1341470528. The cubic root of 20206231 is about 272.3715681291.

Adding to 20206231 its reverse (13260202), we get a palindrome (33466433).

The spelling of 20206231 in words is "twenty million, two hundred six thousand, two hundred thirty-one".