1660920 has 32 divisors (see below), whose sum is σ = 4983120. Its totient is φ = 442880.

The previous prime is 1660889. The next prime is 1660921. The reversal of 1660920 is 290661.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6801 + ... + 7040.

2^1660920 is an apocalyptic number.

1660920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660920 is an abundant number, since it is smaller than the sum of its proper divisors (3322200).

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

1660920 is a wasteful number, since it uses less digits than its factorization.

1660920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13855 (or 13851 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1660920 is about 1288.7668524601. The cubic root of 1660920 is about 118.4266846964.

The spelling of 1660920 in words is "one million, six hundred sixty thousand, nine hundred twenty".