20117906 has 8 divisors (see below), whose sum is σ = 30249804. Its totient is φ = 10034640.

The previous prime is 20117891. The next prime is 20117917. The reversal of 20117906 is 60971102.

It can be written as a sum of positive squares in 2 ways, for example, as 19882681 + 235225 = 4459^2 + 485^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11105 + ... + 12788.

Almost surely, 2^20117906 is an apocalyptic number.

20117906 is a deficient number, since it is larger than the sum of its proper divisors (10131898).

20117906 is a wasteful number, since it uses less digits than its factorization.

20117906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24316.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20117906 is about 4485.2988752144. The cubic root of 20117906 is about 271.9741270805.

The spelling of 20117906 in words is "twenty million, one hundred seventeen thousand, nine hundred six".