16660020 has 144 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 3893760.

The previous prime is 16660013. The next prime is 16660031. The reversal of 16660020 is 2006661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314314 + ... + 314366.

It is an arithmetic number, because the mean of its divisors is an integer number (368928).

Almost surely, 2^16660020 is an apocalyptic number.

16660020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16660020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26562816).

16660020 is an abundant number, since it is smaller than the sum of its proper divisors (36465612).

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

16660020 is a wasteful number, since it uses less digits than its factorization.

16660020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 16660020 is about 4081.6687763708. The cubic root of 16660020 is about 255.4025169272.

Adding to 16660020 its reverse (2006661), we get a palindrome (18666681).

The spelling of 16660020 in words is "sixteen million, six hundred sixty thousand, twenty".