16866020 has 12 divisors (see below), whose sum is σ = 35418684. Its totient is φ = 6746400.

The previous prime is 16866001. The next prime is 16866029. The reversal of 16866020 is 2066861.

It can be written as a sum of positive squares in 2 ways, for example, as 7268416 + 9597604 = 2696^2 + 3098^2 .

It is not an unprimeable number, because it can be changed into a prime (16866029) 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, 421631 + ... + 421670.

It is an arithmetic number, because the mean of its divisors is an integer number (2951557).

Almost surely, 2^16866020 is an apocalyptic number.

16866020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16866020 is an abundant number, since it is smaller than the sum of its proper divisors (18552664).

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

16866020 is a wasteful number, since it uses less digits than its factorization.

16866020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843310 (or 843308 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16866020 is about 4106.8260250466. The cubic root of 16866020 is about 256.4508859019.

The spelling of 16866020 in words is "sixteen million, eight hundred sixty-six thousand, twenty".