20666116 has 9 divisors (see below), whose sum is σ = 36181621. Its totient is φ = 10328512.

The previous prime is 20666111. The next prime is 20666143. The reversal of 20666116 is 61166602.

The square root of 20666116 is 4546.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 2262016 = 4290^2 + 1504^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20666111) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7956 + ... + 10228.

Almost surely, 2^20666116 is an apocalyptic number.

20666116 is the 4546-th square number.

It is an amenable number.

20666116 is a deficient number, since it is larger than the sum of its proper divisors (15515505).

20666116 is an frugal number, since it uses more digits than its factorization.

20666116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550 (or 2275 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The cubic root of 20666116 is about 274.4224396363.

The spelling of 20666116 in words is "twenty million, six hundred sixty-six thousand, one hundred sixteen".