20053663 has 16 divisors (see below), whose sum is σ = 23556096. Its totient is φ = 16716960.

The previous prime is 20053639. The next prime is 20053673. The reversal of 20053663 is 36635002.

It is a cyclic number.

It is not a de Polignac number, because 20053663 - 2¹³ = 20045471 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 (20053603) 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 15 ways as a sum of consecutive naturals, for example, 70720 + ... + 71002.

It is an arithmetic number, because the mean of its divisors is an integer number (1472256).

Almost surely, 2^20053663 is an apocalyptic number.

20053663 is a deficient number, since it is larger than the sum of its proper divisors (3502433).

20053663 is a wasteful number, since it uses less digits than its factorization.

20053663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 20053663 is about 4478.1316416559. The cubic root of 20053663 is about 271.6843178381.

Adding to 20053663 its reverse (36635002), we get a palindrome (56688665).

The spelling of 20053663 in words is "twenty million, fifty-three thousand, six hundred sixty-three".