20001133231 has 4 divisors (see below), whose sum is σ = 20001454200. Its totient is φ = 20000812264.

The previous prime is 20001133223. The next prime is 20001133249. The reversal of 20001133231 is 13233110002.

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 20001133231 - 2³ = 20001133223 is a prime.

It is a super-2 number, since 2×20001133231² (a number of 21 digits) 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 (20001133331) 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, 33541 + ... + 202798.

It is an arithmetic number, because the mean of its divisors is an integer number (5000363550).

Almost surely, 2^20001133231 is an apocalyptic number.

20001133231 is a deficient number, since it is larger than the sum of its proper divisors (320969).

20001133231 is an equidigital number, since it uses as much as digits as its factorization.

20001133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320968.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001133231 its reverse (13233110002), we get a palindrome (33234243233).

The spelling of 20001133231 in words is "twenty billion, one million, one hundred thirty-three thousand, two hundred thirty-one".