22169556 has 18 divisors (see below), whose sum is σ = 56039802. Its totient is φ = 7389840.

The previous prime is 22169551. The next prime is 22169569. The reversal of 22169556 is 65596122.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 1648656 = 4530^2 + 1284^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 615821 = 22169556 / (2 + 2 + 1 + 6 + 9 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 22169556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22169551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307875 + ... + 307946.

Almost surely, 2^22169556 is an apocalyptic number.

It is an amenable number.

22169556 is an abundant number, since it is smaller than the sum of its proper divisors (33870246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22169556 is a wasteful number, since it uses less digits than its factorization.

22169556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615831 (or 615826 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 22169556 is about 4708.4557978174. The cubic root of 22169556 is about 280.9219440158.

The spelling of 22169556 in words is "twenty-two million, one hundred sixty-nine thousand, five hundred fifty-six".