20118609 has 12 divisors (see below), whose sum is σ = 33211776. Its totient is φ = 11496312.

The previous prime is 20118551. The next prime is 20118617. The reversal of 20118609 is 90681102.

It is not a de Polignac number, because 20118609 - 2⁷ = 20118481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20118509) 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 11 ways as a sum of consecutive naturals, for example, 159609 + ... + 159734.

It is an arithmetic number, because the mean of its divisors is an integer number (2767648).

Almost surely, 2^20118609 is an apocalyptic number.

It is an amenable number.

20118609 is a deficient number, since it is larger than the sum of its proper divisors (13093167).

20118609 is a wasteful number, since it uses less digits than its factorization.

20118609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319356 (or 319353 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 20118609 is about 4485.3772416598. The cubic root of 20118609 is about 271.9772949978.

The spelling of 20118609 in words is "twenty million, one hundred eighteen thousand, six hundred nine".