1980820 has 12 divisors (see below), whose sum is σ = 4159764. Its totient is φ = 792320.

The previous prime is 1980817. The next prime is 1980821. The reversal of 1980820 is 280891.

It can be written as a sum of positive squares in 2 ways, for example, as 583696 + 1397124 = 764^2 + 1182^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 49501 + ... + 49540.

It is an arithmetic number, because the mean of its divisors is an integer number (346647).

2^1980820 is an apocalyptic number.

1980820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980820 is an abundant number, since it is smaller than the sum of its proper divisors (2178944).

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

1980820 is a wasteful number, since it uses less digits than its factorization.

1980820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99050 (or 99048 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1980820 is about 1407.4160720981. The cubic root of 1980820 is about 125.5880558509.

The spelling of 1980820 in words is "one million, nine hundred eighty thousand, eight hundred twenty".