20001011233231 has 48 divisors (see below), whose sum is σ = 25977754632960. Its totient is φ = 15258886997760.

The previous prime is 20001011233213. The next prime is 20001011233243. The reversal of 20001011233231 is 13233211010002.

It is not a de Polignac number, because 20001011233231 - 2¹⁷ = 20001011102159 is a prime.

It is a super-2 number, since 2×20001011233231² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 20001011233199 and 20001011233208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001011233201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7788286 + ... + 10032916.

It is an arithmetic number, because the mean of its divisors is an integer number (541203221520).

Almost surely, 2^{20001011233231} is an apocalyptic number.

20001011233231 is a deficient number, since it is larger than the sum of its proper divisors (5976743399729).

20001011233231 is a wasteful number, since it uses less digits than its factorization.

20001011233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245244 (or 2245237 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20001011233231 its reverse (13233211010002), we get a palindrome (33234222243233).

The spelling of 20001011233231 in words is "twenty trillion, one billion, eleven million, two hundred thirty-three thousand, two hundred thirty-one".