20651013 has 12 divisors (see below), whose sum is σ = 29942848. Its totient is φ = 13714920.

The previous prime is 20650997. The next prime is 20651021. The reversal of 20651013 is 31015602.

20651013 is a `hidden beast` number, since 2 + 0 + 651 + 0 + 13 = 666.

It is not a de Polignac number, because 20651013 - 2⁴ = 20650997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651063) 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 11 ways as a sum of consecutive naturals, for example, 1795 + ... + 6672.

Almost surely, 2^20651013 is an apocalyptic number.

It is an amenable number.

20651013 is a deficient number, since it is larger than the sum of its proper divisors (9291835).

20651013 is a wasteful number, since it uses less digits than its factorization.

20651013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8744 (or 8741 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20651013 is about 4544.3385657321. The cubic root of 20651013 is about 274.3555731424.

Adding to 20651013 its reverse (31015602), we get a palindrome (51666615).

The spelling of 20651013 in words is "twenty million, six hundred fifty-one thousand, thirteen".