20145663 has 12 divisors (see below), whose sum is σ = 30811248. Its totient is φ = 12640320.

The previous prime is 20145617. The next prime is 20145673. The reversal of 20145663 is 36654102.

20145663 is a `hidden beast` number, since 201 + 456 + 6 + 3 = 666.

It is not a de Polignac number, because 20145663 - 2⁸ = 20145407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65683 + ... + 65988.

It is an arithmetic number, because the mean of its divisors is an integer number (2567604).

Almost surely, 2^20145663 is an apocalyptic number.

20145663 is a deficient number, since it is larger than the sum of its proper divisors (10665585).

20145663 is a wasteful number, since it uses less digits than its factorization.

20145663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131694 (or 131691 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20145663 is about 4488.3920283326. The cubic root of 20145663 is about 272.0991519646.

Adding to 20145663 its reverse (36654102), we get a palindrome (56799765).

The spelling of 20145663 in words is "twenty million, one hundred forty-five thousand, six hundred sixty-three".