20755663 has 4 divisors (see below), whose sum is σ = 20764960. Its totient is φ = 20746368.

The previous prime is 20755661. The next prime is 20755681. The reversal of 20755663 is 36655702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20755663 - 2¹ = 20755661 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 (20755661) 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, 943 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (5191240).

Almost surely, 2^20755663 is an apocalyptic number.

20755663 is a deficient number, since it is larger than the sum of its proper divisors (9297).

20755663 is an equidigital number, since it uses as much as digits as its factorization.

20755663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9296.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 20755663 is about 4555.8383421715. The cubic root of 20755663 is about 274.8182291900.

The spelling of 20755663 in words is "twenty million, seven hundred fifty-five thousand, six hundred sixty-three".