20210031231 has 32 divisors (see below), whose sum is σ = 29837660160. Its totient is φ = 12088569600.

The previous prime is 20210031223. The next prime is 20210031263. The reversal of 20210031231 is 13213001202.

It is not a de Polignac number, because 20210031231 - 2³ = 20210031223 is a prime.

It is a super-2 number, since 2×20210031231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20210031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210031431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410010 + ... + 456648.

It is an arithmetic number, because the mean of its divisors is an integer number (932426880).

Almost surely, 2^20210031231 is an apocalyptic number.

20210031231 is a deficient number, since it is larger than the sum of its proper divisors (9627628929).

20210031231 is a wasteful number, since it uses less digits than its factorization.

20210031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46967.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20210031231 its reverse (13213001202), we get a palindrome (33423032433).

The spelling of 20210031231 in words is "twenty billion, two hundred ten million, thirty-one thousand, two hundred thirty-one".