20166091 has 8 divisors (see below), whose sum is σ = 22128624. Its totient is φ = 18225120.

The previous prime is 20166077. The next prime is 20166119. The reversal of 20166091 is 19066102.

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

It is a cyclic number.

It is not a de Polignac number, because 20166091 - 2²³ = 11777483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20166001) 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, 3396 + ... + 7201.

It is an arithmetic number, because the mean of its divisors is an integer number (2766078).

Almost surely, 2^20166091 is an apocalyptic number.

20166091 is a deficient number, since it is larger than the sum of its proper divisors (1962533).

20166091 is a wasteful number, since it uses less digits than its factorization.

20166091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10781.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20166091 is about 4490.6670996635. The cubic root of 20166091 is about 272.1910917492.

The spelling of 20166091 in words is "twenty million, one hundred sixty-six thousand, ninety-one".