22720072 has 16 divisors (see below), whose sum is σ = 43752060. Its totient is φ = 11052864.

The previous prime is 22720037. The next prime is 22720073. The reversal of 22720072 is 27002722.

It can be written as a sum of positive squares in 2 ways, for example, as 18028516 + 4691556 = 4246^2 + 2166^2 .

It is not an unprimeable number, because it can be changed into a prime (22720073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38083 + ... + 38674.

Almost surely, 2^22720072 is an apocalyptic number.

It is an amenable number.

22720072 is a deficient number, since it is larger than the sum of its proper divisors (21031988).

22720072 is a wasteful number, since it uses less digits than its factorization.

22720072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76800 (or 76796 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 22720072 is about 4766.5576677514. The cubic root of 22720072 is about 283.2282492275.

Adding to 22720072 its reverse (27002722), we get a palindrome (49722794).

The spelling of 22720072 in words is "twenty-two million, seven hundred twenty thousand, seventy-two".