20604765 has 16 divisors (see below), whose sum is σ = 34907328. Its totient is φ = 10342656.

The previous prime is 20604743. The next prime is 20604767. The reversal of 20604765 is 56740602.

It is not a de Polignac number, because 20604765 - 2¹⁰ = 20603741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40147 + ... + 40656.

It is an arithmetic number, because the mean of its divisors is an integer number (2181708).

Almost surely, 2^20604765 is an apocalyptic number.

It is an amenable number.

20604765 is a deficient number, since it is larger than the sum of its proper divisors (14302563).

20604765 is a wasteful number, since it uses less digits than its factorization.

20604765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80828.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20604765 is about 4539.2471842807. The cubic root of 20604765 is about 274.1506133785.

The spelling of 20604765 in words is "twenty million, six hundred four thousand, seven hundred sixty-five".