20031641 has 6 divisors (see below), whose sum is σ = 23302170. Its totient is φ = 17169936.

The previous prime is 20031637. The next prime is 20031659. The reversal of 20031641 is 14613002.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 8976016 = 3325^2 + 2996^2 .

It is not a de Polignac number, because 20031641 - 2² = 20031637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204356 + ... + 204453.

It is an arithmetic number, because the mean of its divisors is an integer number (3883695).

Almost surely, 2^20031641 is an apocalyptic number.

It is an amenable number.

20031641 is a deficient number, since it is larger than the sum of its proper divisors (3270529).

20031641 is an equidigital number, since it uses as much as digits as its factorization.

20031641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408823 (or 408816 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20031641 is about 4475.6721282954. The cubic root of 20031641 is about 271.5848310514.

Adding to 20031641 its reverse (14613002), we get a palindrome (34644643).

The spelling of 20031641 in words is "twenty million, thirty-one thousand, six hundred forty-one".