20166684 has 12 divisors (see below), whose sum is σ = 47055624. Its totient is φ = 6722224.

The previous prime is 20166683. The next prime is 20166697. The reversal of 20166684 is 48666102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×20166684³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840267 + ... + 840290.

It is an arithmetic number, because the mean of its divisors is an integer number (3921302).

Almost surely, 2^20166684 is an apocalyptic number.

It is an amenable number.

20166684 is an abundant number, since it is smaller than the sum of its proper divisors (26888940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20166684 is a wasteful number, since it uses less digits than its factorization.

20166684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680564 (or 1680562 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20166684 is about 4490.7331250031. The cubic root of 20166684 is about 272.1937597218.

The spelling of 20166684 in words is "twenty million, one hundred sixty-six thousand, six hundred eighty-four".