20166961 has 8 divisors (see below), whose sum is σ = 21802880. Its totient is φ = 18588528.

The previous prime is 20166959. The next prime is 20166983. The reversal of 20166961 is 16966102.

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 20166961 - 2¹ = 20166959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20166931) 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 7 ways as a sum of consecutive naturals, for example, 13641 + ... + 15046.

It is an arithmetic number, because the mean of its divisors is an integer number (2725360).

Almost surely, 2^20166961 is an apocalyptic number.

It is an amenable number.

20166961 is a deficient number, since it is larger than the sum of its proper divisors (1635919).

20166961 is a wasteful number, since it uses less digits than its factorization.

20166961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28743.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20166961 is about 4490.7639661866. The cubic root of 20166961 is about 272.1950059575.

The spelling of 20166961 in words is "twenty million, one hundred sixty-six thousand, nine hundred sixty-one".