20113663 has 4 divisors (see below), whose sum is σ = 20159920. Its totient is φ = 20067408.

The previous prime is 20113651. The next prime is 20113673. The reversal of 20113663 is 36631102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36631102 = 2 ⋅18315551.

It is a cyclic number.

It is not a de Polignac number, because 20113663 - 2¹⁷ = 19982591 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 (20113633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22470 + ... + 23347.

It is an arithmetic number, because the mean of its divisors is an integer number (5039980).

Almost surely, 2^20113663 is an apocalyptic number.

20113663 is a deficient number, since it is larger than the sum of its proper divisors (46257).

20113663 is an equidigital number, since it uses as much as digits as its factorization.

20113663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46256.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20113663 is about 4484.8258606104. The cubic root of 20113663 is about 271.9550053529.

Adding to 20113663 its reverse (36631102), we get a palindrome (56744765).

The spelling of 20113663 in words is "twenty million, one hundred thirteen thousand, six hundred sixty-three".