22209724 has 12 divisors (see below), whose sum is σ = 39526200. Its totient is φ = 10916528.

The previous prime is 22209713. The next prime is 22209749. The reversal of 22209724 is 42790222.

It is a junction number, because it is equal to n+sod(n) for n = 22209692 and 22209701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46819 + ... + 47290.

It is an arithmetic number, because the mean of its divisors is an integer number (3293850).

Almost surely, 2^22209724 is an apocalyptic number.

It is an amenable number.

22209724 is a deficient number, since it is larger than the sum of its proper divisors (17316476).

22209724 is a wasteful number, since it uses less digits than its factorization.

22209724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94172 (or 94170 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 22209724 is about 4712.7193848138. The cubic root of 22209724 is about 281.0915048386.

Adding to 22209724 its reverse (42790222), we get a palindrome (64999946).

It can be divided in two parts, 2220972 and 4, that multiplied together give a palindrome (8883888).

The spelling of 22209724 in words is "twenty-two million, two hundred nine thousand, seven hundred twenty-four".