20504605 has 16 divisors (see below), whose sum is σ = 27215424. Its totient is φ = 14705280.

The previous prime is 20504597. The next prime is 20504611. The reversal of 20504605 is 50640502.

It is not a de Polignac number, because 20504605 - 2³ = 20504597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1462 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (1700964).

Almost surely, 2^20504605 is an apocalyptic number.

It is an amenable number.

20504605 is a deficient number, since it is larger than the sum of its proper divisors (6710819).

20504605 is a wasteful number, since it uses less digits than its factorization.

20504605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20504605 is about 4528.2010776908. The cubic root of 20504605 is about 273.7056752182.

The spelling of 20504605 in words is "twenty million, five hundred four thousand, six hundred five".