2157020 has 24 divisors (see below), whose sum is σ = 4687200. Its totient is φ = 832832.

The previous prime is 2157017. The next prime is 2157031. The reversal of 2157020 is 207512.

2157020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2157020.

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, 1280 + ... + 2439.

It is an arithmetic number, because the mean of its divisors is an integer number (195300).

2^2157020 is an apocalyptic number.

2157020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157020 is an abundant number, since it is smaller than the sum of its proper divisors (2530180).

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

2157020 is a wasteful number, since it uses less digits than its factorization.

2157020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757 (or 3755 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 2157020 is about 1468.6796791677. The cubic root of 2157020 is about 129.2066076042.

The spelling of 2157020 in words is "two million, one hundred fifty-seven thousand, twenty".