20120609 has 4 divisors (see below), whose sum is σ = 20129604. Its totient is φ = 20111616.

The previous prime is 20120543. The next prime is 20120623. The reversal of 20120609 is 90602102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90602102 = 2 ⋅45301051.

It can be written as a sum of positive squares in 2 ways, for example, as 10336225 + 9784384 = 3215^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120609 - 2²⁰ = 19072033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20120629) 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, 1769 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (5032401).

Almost surely, 2^20120609 is an apocalyptic number.

It is an amenable number.

20120609 is a deficient number, since it is larger than the sum of its proper divisors (8995).

20120609 is an equidigital number, since it uses as much as digits as its factorization.

20120609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8994.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20120609 is about 4485.6001828072. The cubic root of 20120609 is about 271.9863071610.

The spelling of 20120609 in words is "twenty million, one hundred twenty thousand, six hundred nine".