20688053 has 4 divisors (see below), whose sum is σ = 20716140. Its totient is φ = 20659968.

The previous prime is 20688043. The next prime is 20688071. The reversal of 20688053 is 35088602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 9351364 = 3367^2 + 3058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20688053 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 (20688013) 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, 12908 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (5179035).

Almost surely, 2^20688053 is an apocalyptic number.

It is an amenable number.

20688053 is a deficient number, since it is larger than the sum of its proper divisors (28087).

20688053 is an equidigital number, since it uses as much as digits as its factorization.

20688053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28086.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20688053 is about 4548.4121405167. The cubic root of 20688053 is about 274.5195047426.

The spelling of 20688053 in words is "twenty million, six hundred eighty-eight thousand, fifty-three".