22204640 has 48 divisors (see below), whose sum is σ = 52989552. Its totient is φ = 8792064.

The previous prime is 22204639. The next prime is 22204661. The reversal of 22204640 is 4640222.

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

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, 16472 + ... + 17768.

It is an arithmetic number, because the mean of its divisors is an integer number (1103949).

Almost surely, 2^22204640 is an apocalyptic number.

22204640 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 22204640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26494776).

22204640 is an abundant number, since it is smaller than the sum of its proper divisors (30784912).

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

22204640 is a wasteful number, since it uses less digits than its factorization.

22204640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22204640 is about 4712.1799626075. The cubic root of 22204640 is about 281.0700551008.

Adding to 22204640 its reverse (4640222), we get a palindrome (26844862).

The spelling of 22204640 in words is "twenty-two million, two hundred four thousand, six hundred forty".