2220636 has 24 divisors (see below), whose sum is σ = 5652864. Its totient is φ = 672880.

The previous prime is 2220553. The next prime is 2220643. The reversal of 2220636 is 6360222.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8280 + ... + 8543.

It is an arithmetic number, because the mean of its divisors is an integer number (235536).

2^2220636 is an apocalyptic number.

It is an amenable number.

2220636 is an abundant number, since it is smaller than the sum of its proper divisors (3432228).

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

2220636 is a wasteful number, since it uses less digits than its factorization.

2220636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16841 (or 16839 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2220636 is about 1490.1798549168. The cubic root of 2220636 is about 130.4645313981.

Adding to 2220636 its reverse (6360222), we get a palindrome (8580858).

The spelling of 2220636 in words is "two million, two hundred twenty thousand, six hundred thirty-six".