2206640 has 20 divisors (see below), whose sum is σ = 5130624. Its totient is φ = 882624.

The previous prime is 2206627. The next prime is 2206649. The reversal of 2206640 is 466022.

It is a tau number, because it is divible by the number of its divisors (20).

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

It is not an unprimeable number, because it can be changed into a prime (2206649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13712 + ... + 13871.

2^2206640 is an apocalyptic number.

2206640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2206640 is an abundant number, since it is smaller than the sum of its proper divisors (2923984).

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

2206640 is a wasteful number, since it uses less digits than its factorization.

2206640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27596 (or 27590 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2206640 is about 1485.4763545745. The cubic root of 2206640 is about 130.1898606470.

The spelling of 2206640 in words is "two million, two hundred six thousand, six hundred forty".