22180736 has 32 divisors (see below), whose sum is σ = 44523000. Its totient is φ = 11006464.

The previous prime is 22180729. The next prime is 22180747. The reversal of 22180736 is 63708122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 22180699 and 22180708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18491 + ... + 19653.

Almost surely, 2^22180736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22180736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22261500).

22180736 is an abundant number, since it is smaller than the sum of its proper divisors (22342264).

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

22180736 is a wasteful number, since it uses less digits than its factorization.

22180736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 22180736 is about 4709.6428739343. The cubic root of 22180736 is about 280.9691586065.

Adding to 22180736 its reverse (63708122), we get a palindrome (85888858).

The spelling of 22180736 in words is "twenty-two million, one hundred eighty thousand, seven hundred thirty-six".