20538653 has 4 divisors (see below), whose sum is σ = 20742108. Its totient is φ = 20335200.

The previous prime is 20538643. The next prime is 20538673. The reversal of 20538653 is 35683502.

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 10125124 + 10413529 = 3182^2 + 3227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20538653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101576 + ... + 101777.

It is an arithmetic number, because the mean of its divisors is an integer number (5185527).

Almost surely, 2^20538653 is an apocalyptic number.

It is an amenable number.

20538653 is a deficient number, since it is larger than the sum of its proper divisors (203455).

20538653 is a wasteful number, since it uses less digits than its factorization.

20538653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203454.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20538653 is about 4531.9590686589. The cubic root of 20538653 is about 273.8570879931.

The spelling of 20538653 in words is "twenty million, five hundred thirty-eight thousand, six hundred fifty-three".