20684005 has 8 divisors (see below), whose sum is σ = 24846624. Its totient is φ = 16530000.

The previous prime is 20683997. The next prime is 20684009. The reversal of 20684005 is 50048602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20684005 - 2³ = 20683997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5830 + ... + 8680.

It is an arithmetic number, because the mean of its divisors is an integer number (3105828).

Almost surely, 2^20684005 is an apocalyptic number.

It is an amenable number.

20684005 is a deficient number, since it is larger than the sum of its proper divisors (4162619).

20684005 is a wasteful number, since it uses less digits than its factorization.

20684005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20684005 is about 4547.9671282893. The cubic root of 20684005 is about 274.5015986361.

The spelling of 20684005 in words is "twenty million, six hundred eighty-four thousand, five".