20133231 has 4 divisors (see below), whose sum is σ = 26844312. Its totient is φ = 13422152.

The previous prime is 20133199. The next prime is 20133247. The reversal of 20133231 is 13233102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20133231 - 2⁵ = 20133199 is a prime.

It is a super-2 number, since 2×20133231² = 810693980998722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20133231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133251) 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, 3355536 + ... + 3355541.

It is an arithmetic number, because the mean of its divisors is an integer number (6711078).

Almost surely, 2^20133231 is an apocalyptic number.

20133231 is a deficient number, since it is larger than the sum of its proper divisors (6711081).

20133231 is an equidigital number, since it uses as much as digits as its factorization.

20133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6711080.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20133231 is about 4487.0069088425. The cubic root of 20133231 is about 272.0431691503.

Adding to 20133231 its reverse (13233102), we get a palindrome (33366333).

The spelling of 20133231 in words is "twenty million, one hundred thirty-three thousand, two hundred thirty-one".