20663461 has 12 divisors (see below), whose sum is σ = 25573152. Its totient is φ = 16348176.

The previous prime is 20663437. The next prime is 20663471. The reversal of 20663461 is 16436602.

It is not a de Polignac number, because 20663461 - 2⁷ = 20663333 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 (20663471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7551 + ... + 9916.

It is an arithmetic number, because the mean of its divisors is an integer number (2131096).

Almost surely, 2^20663461 is an apocalyptic number.

It is an amenable number.

20663461 is a deficient number, since it is larger than the sum of its proper divisors (4909691).

20663461 is a wasteful number, since it uses less digits than its factorization.

20663461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500 (or 17487 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20663461 is about 4545.7079756623. The cubic root of 20663461 is about 274.4106873428.

The spelling of 20663461 in words is "twenty million, six hundred sixty-three thousand, four hundred sixty-one".