1666020 has 24 divisors (see below), whose sum is σ = 4665024. Its totient is φ = 444256.

The previous prime is 1666019. The next prime is 1666037. The reversal of 1666020 is 206661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13824 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (194376).

2^1666020 is an apocalyptic number.

1666020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666020 is an abundant number, since it is smaller than the sum of its proper divisors (2999004).

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

1666020 is a wasteful number, since it uses less digits than its factorization.

1666020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27779 (or 27777 counting only the distinct ones).

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

The square root of 1666020 is about 1290.7439715141. The cubic root of 1666020 is about 118.5477740038.

The spelling of 1666020 in words is "one million, six hundred sixty-six thousand, twenty".