20090609 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 15509760.

The previous prime is 20090599. The next prime is 20090611. The reversal of 20090609 is 90609002.

It is a de Polignac number, because none of the positive numbers 2^k-20090609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20090659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7547 + ... + 9855.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^20090609 is an apocalyptic number.

It is an amenable number.

20090609 is a deficient number, since it is larger than the sum of its proper divisors (5190031).

20090609 is a wasteful number, since it uses less digits than its factorization.

20090609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20090609 is about 4482.2549012746. The cubic root of 20090609 is about 271.8510619519.

It can be divided in two parts, 200 and 90609, that added together give a palindrome (90809).

The spelling of 20090609 in words is "twenty million, ninety thousand, six hundred nine".