22720138 has 8 divisors (see below), whose sum is σ = 38948832. Its totient is φ = 9737196.

The previous prime is 22720127. The next prime is 22720189. The reversal of 22720138 is 83102722.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 811420 + ... + 811447.

It is an arithmetic number, because the mean of its divisors is an integer number (4868604).

Almost surely, 2^22720138 is an apocalyptic number.

22720138 is a deficient number, since it is larger than the sum of its proper divisors (16228694).

22720138 is a wasteful number, since it uses less digits than its factorization.

22720138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622876.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 22720138 is about 4766.5645909816. The cubic root of 22720138 is about 283.2285234791.

The spelling of 22720138 in words is "twenty-two million, seven hundred twenty thousand, one hundred thirty-eight".