20166887217 has 8 divisors (see below), whose sum is σ = 27257528224. Its totient is φ = 13260418848.

The previous prime is 20166887207. The next prime is 20166887231. The reversal of 20166887217 is 71278866102.

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

It is not a de Polignac number, because 20166887217 - 2¹⁶ = 20166821681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20166887207) 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, 46042903 + ... + 46043340.

It is an arithmetic number, because the mean of its divisors is an integer number (3407191028).

Almost surely, 2^20166887217 is an apocalyptic number.

It is an amenable number.

20166887217 is a deficient number, since it is larger than the sum of its proper divisors (7090641007).

20166887217 is an equidigital number, since it uses as much as digits as its factorization.

20166887217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92086319.

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 20166887217 in words is "twenty billion, one hundred sixty-six million, eight hundred eighty-seven thousand, two hundred seventeen".