20641051 has 6 divisors (see below), whose sum is σ = 21578060. Its totient is φ = 19743108.

The previous prime is 20641039. The next prime is 20641057. The reversal of 20641051 is 15014602.

It is a de Polignac number, because none of the positive numbers 2^k-20641051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18981 + ... + 20038.

Almost surely, 2^20641051 is an apocalyptic number.

20641051 is a deficient number, since it is larger than the sum of its proper divisors (937009).

20641051 is an equidigital number, since it uses as much as digits as its factorization.

20641051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39065 (or 39042 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20641051 is about 4543.2423444056. The cubic root of 20641051 is about 274.3114498861.

Adding to 20641051 its reverse (15014602), we get a palindrome (35655653).

The spelling of 20641051 in words is "twenty million, six hundred forty-one thousand, fifty-one".