2045820 has 48 divisors (see below), whose sum is σ = 6547968. Its totient is φ = 467520.

The previous prime is 2045819. The next prime is 2045833. The reversal of 2045820 is 285402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2016 + ... + 2855.

It is an arithmetic number, because the mean of its divisors is an integer number (136416).

2^2045820 is an apocalyptic number.

2045820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2045820 is an abundant number, since it is smaller than the sum of its proper divisors (4502148).

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

2045820 is a wasteful number, since it uses less digits than its factorization.

2045820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890 (or 4888 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2045820 is about 1430.3216421491. The cubic root of 2045820 is about 126.9470091200.

The spelling of 2045820 in words is "two million, forty-five thousand, eight hundred twenty".