22220872 has 8 divisors (see below), whose sum is σ = 41664150. Its totient is φ = 11110432.

The previous prime is 22220851. The next prime is 22220879. The reversal of 22220872 is 27802222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 3437316 = 4334^2 + 1854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (22220879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388797 + ... + 1388812.

Almost surely, 2^22220872 is an apocalyptic number.

It is an amenable number.

22220872 is a deficient number, since it is larger than the sum of its proper divisors (19443278).

22220872 is a wasteful number, since it uses less digits than its factorization.

22220872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777615 (or 2777611 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 22220872 is about 4713.9019930414. The cubic root of 22220872 is about 281.1385275443.

The spelling of 22220872 in words is "twenty-two million, two hundred twenty thousand, eight hundred seventy-two".