20684116 has 6 divisors (see below), whose sum is σ = 36197210. Its totient is φ = 10342056.

The previous prime is 20684071. The next prime is 20684117. The reversal of 20684116 is 61148602.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 163216 = 4530^2 + 404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2585511 + ... + 2585518.

Almost surely, 2^20684116 is an apocalyptic number.

It is an amenable number.

20684116 is a deficient number, since it is larger than the sum of its proper divisors (15513094).

20684116 is a wasteful number, since it uses less digits than its factorization.

20684116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171033 (or 5171031 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20684116 is about 4547.9793315274. The cubic root of 20684116 is about 274.5020896697.

The spelling of 20684116 in words is "twenty million, six hundred eighty-four thousand, one hundred sixteen".