20131641 has 12 divisors (see below), whose sum is σ = 29259568. Its totient is φ = 13337784.

The previous prime is 20131609. The next prime is 20131667. The reversal of 20131641 is 14613102.

It is a happy number.

20131641 is a `hidden beast` number, since 20 + 1 + 3 + 1 + 641 = 666.

It is not a de Polignac number, because 20131641 - 2⁵ = 20131609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5395 + ... + 8328.

Almost surely, 2^20131641 is an apocalyptic number.

It is an amenable number.

20131641 is a deficient number, since it is larger than the sum of its proper divisors (9127927).

20131641 is a wasteful number, since it uses less digits than its factorization.

20131641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13892 (or 13889 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20131641 is about 4486.8297271013. The cubic root of 20131641 is about 272.0360075240.

Adding to 20131641 its reverse (14613102), we get a palindrome (34744743).

The spelling of 20131641 in words is "twenty million, one hundred thirty-one thousand, six hundred forty-one".