22720165 has 16 divisors (see below), whose sum is σ = 29465856. Its totient is φ = 16718400.

The previous prime is 22720127. The next prime is 22720189. The reversal of 22720165 is 56102722.

It is not a de Polignac number, because 22720165 - 2⁷ = 22720037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27610 + ... + 28420.

It is an arithmetic number, because the mean of its divisors is an integer number (1841616).

Almost surely, 2^22720165 is an apocalyptic number.

It is an amenable number.

22720165 is a deficient number, since it is larger than the sum of its proper divisors (6745691).

22720165 is a wasteful number, since it uses less digits than its factorization.

22720165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 22720165 is about 4766.5674232093. The cubic root of 22720165 is about 283.2286356728.

Adding to 22720165 its reverse (56102722), we get a palindrome (78822887).

The spelling of 22720165 in words is "twenty-two million, seven hundred twenty thousand, one hundred sixty-five".