20504653 has 16 divisors (see below), whose sum is σ = 23068080. Its totient is φ = 18095616.

The previous prime is 20504647. The next prime is 20504677. The reversal of 20504653 is 35640502.

It can be written as a sum of positive squares in 8 ways, for example, as 56169 + 20448484 = 237^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504653 - 2¹³ = 20496461 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 (20504053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51451 + ... + 51847.

It is an arithmetic number, because the mean of its divisors is an integer number (1441755).

Almost surely, 2^20504653 is an apocalyptic number.

It is an amenable number.

20504653 is a deficient number, since it is larger than the sum of its proper divisors (2563427).

20504653 is a wasteful number, since it uses less digits than its factorization.

20504653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20504653 is about 4528.2063778057. The cubic root of 20504653 is about 273.7058887940.

The spelling of 20504653 in words is "twenty million, five hundred four thousand, six hundred fifty-three".