1660820 has 24 divisors (see below), whose sum is σ = 3986304. Its totient is φ = 569376.

The previous prime is 1660793. The next prime is 1660837. The reversal of 1660820 is 280661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5792 + ... + 6071.

It is an arithmetic number, because the mean of its divisors is an integer number (166096).

2^1660820 is an apocalyptic number.

1660820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660820 is an abundant number, since it is smaller than the sum of its proper divisors (2325484).

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

1660820 is a wasteful number, since it uses less digits than its factorization.

1660820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879 (or 11877 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1660820 is about 1288.7280550993. The cubic root of 1660820 is about 118.4243079200.

The spelling of 1660820 in words is "one million, six hundred sixty thousand, eight hundred twenty".