20523231 has 6 divisors (see below), whose sum is σ = 29644680. Its totient is φ = 13682148.

The previous prime is 20523227. The next prime is 20523241. The reversal of 20523231 is 13232502.

It is not a de Polignac number, because 20523231 - 2² = 20523227 is a prime.

It is a super-3 number, since 3×20523231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140171 + ... + 1140188.

It is an arithmetic number, because the mean of its divisors is an integer number (4940780).

Almost surely, 2^20523231 is an apocalyptic number.

20523231 is a deficient number, since it is larger than the sum of its proper divisors (9121449).

20523231 is a wasteful number, since it uses less digits than its factorization.

20523231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280365 (or 2280362 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20523231 is about 4530.2572774623. The cubic root of 20523231 is about 273.7885265099.

Adding to 20523231 its reverse (13232502), we get a palindrome (33755733).

It can be divided in two parts, 205 and 23231, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 20523231 in words is "twenty million, five hundred twenty-three thousand, two hundred thirty-one".