20201331 has 4 divisors (see below), whose sum is σ = 26935112. Its totient is φ = 13467552.

The previous prime is 20201329. The next prime is 20201341. The reversal of 20201331 is 13310202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20201331 - 2¹ = 20201329 is a prime.

It is a super-2 number, since 2×20201331² = 816187548343122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201341) 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, 3366886 + ... + 3366891.

It is an arithmetic number, because the mean of its divisors is an integer number (6733778).

Almost surely, 2^20201331 is an apocalyptic number.

20201331 is a deficient number, since it is larger than the sum of its proper divisors (6733781).

20201331 is an equidigital number, since it uses as much as digits as its factorization.

20201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733780.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20201331 is about 4494.5890802163. The cubic root of 20201331 is about 272.3495496970.

Adding to 20201331 its reverse (13310202), we get a palindrome (33511533).

The spelling of 20201331 in words is "twenty million, two hundred one thousand, three hundred thirty-one".