22720538 has 4 divisors (see below), whose sum is σ = 34080810. Its totient is φ = 11360268.

The previous prime is 22720531. The next prime is 22720541. The reversal of 22720538 is 83502722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 5139289 = 4193^2 + 2267^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22720538.

It is not an unprimeable number, because it can be changed into a prime (22720531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5680133 + ... + 5680136.

Almost surely, 2^22720538 is an apocalyptic number.

22720538 is a deficient number, since it is larger than the sum of its proper divisors (11360272).

22720538 is a wasteful number, since it uses less digits than its factorization.

22720538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360271.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 22720538 is about 4766.6065497375. The cubic root of 22720538 is about 283.2301855985.

The spelling of 22720538 in words is "twenty-two million, seven hundred twenty thousand, five hundred thirty-eight".