20201131 has 8 divisors (see below), whose sum is σ = 20517840. Its totient is φ = 19886592.

The previous prime is 20201113. The next prime is 20201141. The reversal of 20201131 is 13110202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20201131 - 2⁹ = 20200619 is a prime.

It is a super-2 number, since 2×20201131² = 816171387358322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31096 + ... + 31738.

It is an arithmetic number, because the mean of its divisors is an integer number (2564730).

Almost surely, 2^20201131 is an apocalyptic number.

20201131 is a deficient number, since it is larger than the sum of its proper divisors (316709).

20201131 is an equidigital number, since it uses as much as digits as its factorization.

20201131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20201131 is about 4494.5668311863. The cubic root of 20201131 is about 272.3486509098.

Adding to 20201131 its reverse (13110202), we get a palindrome (33311333).

The spelling of 20201131 in words is "twenty million, two hundred one thousand, one hundred thirty-one".