2051660 has 36 divisors (see below), whose sum is σ = 4673088. Its totient is φ = 756288.

The previous prime is 2051653. The next prime is 2051671. The reversal of 2051660 is 661502.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3077 + ... + 3683.

It is an arithmetic number, because the mean of its divisors is an integer number (129808).

2^2051660 is an apocalyptic number.

2051660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2336544).

2051660 is an abundant number, since it is smaller than the sum of its proper divisors (2621428).

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

2051660 is a wasteful number, since it uses less digits than its factorization.

2051660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2051660 is about 1432.3616861673. The cubic root of 2051660 is about 127.0676887188.

The spelling of 2051660 in words is "two million, fifty-one thousand, six hundred sixty".