22740220 has 24 divisors (see below), whose sum is σ = 50564304. Its totient is φ = 8560896.

The previous prime is 22740217. The next prime is 22740227. The reversal of 22740220 is 2204722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22740227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33102 + ... + 33781.

It is an arithmetic number, because the mean of its divisors is an integer number (2106846).

Almost surely, 2^22740220 is an apocalyptic number.

22740220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22740220 is an abundant number, since it is smaller than the sum of its proper divisors (27824084).

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

22740220 is a wasteful number, since it uses less digits than its factorization.

22740220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66909 (or 66907 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 22740220 is about 4768.6706743075. The cubic root of 22740220 is about 283.3119460981.

Adding to 22740220 its reverse (2204722), we get a palindrome (24944942).

The spelling of 22740220 in words is "twenty-two million, seven hundred forty thousand, two hundred twenty".