20470609 has 4 divisors (see below), whose sum is σ = 20487780. Its totient is φ = 20453440.

The previous prime is 20470573. The next prime is 20470627. The reversal of 20470609 is 90607402.

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 18037009 + 2433600 = 4247^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 20470609 - 2⁹ = 20470097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20470679) 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, 6652 + ... + 9229.

It is an arithmetic number, because the mean of its divisors is an integer number (5121945).

Almost surely, 2^20470609 is an apocalyptic number.

It is an amenable number.

20470609 is a deficient number, since it is larger than the sum of its proper divisors (17171).

20470609 is a wasteful number, since it uses less digits than its factorization.

20470609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17170.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20470609 is about 4524.4457119077. The cubic root of 20470609 is about 273.5543263661.

The spelling of 20470609 in words is "twenty million, four hundred seventy thousand, six hundred nine".