20201131231 has 4 divisors (see below), whose sum is σ = 20204096200. Its totient is φ = 20198166264.

The previous prime is 20201131213. The next prime is 20201131273. The reversal of 20201131231 is 13213110202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13213110202 = 2 ⋅6606555101.

It is a cyclic number.

It is not a de Polignac number, because 20201131231 - 2⁷ = 20201131103 is a prime.

It is a super-2 number, since 2×20201131231² (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 (20201131031) 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, 1472241 + ... + 1485898.

It is an arithmetic number, because the mean of its divisors is an integer number (5051024050).

Almost surely, 2^20201131231 is an apocalyptic number.

20201131231 is a deficient number, since it is larger than the sum of its proper divisors (2964969).

20201131231 is an equidigital number, since it uses as much as digits as its factorization.

20201131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964968.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20201131231 its reverse (13213110202), we get a palindrome (33414241433).

The spelling of 20201131231 in words is "twenty billion, two hundred one million, one hundred thirty-one thousand, two hundred thirty-one".