22218824 has 8 divisors (see below), whose sum is σ = 41660310. Its totient is φ = 11109408.

The previous prime is 22218799. The next prime is 22218841. The reversal of 22218824 is 42881222.

It can be written as a sum of positive squares in only one way, i.e., 13912900 + 8305924 = 3730^2 + 2882^2 .

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

It is a super-2 number, since 2×22218824² = 987352279885952, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388669 + ... + 1388684.

Almost surely, 2^22218824 is an apocalyptic number.

It is an amenable number.

22218824 is a deficient number, since it is larger than the sum of its proper divisors (19441486).

22218824 is a wasteful number, since it uses less digits than its factorization.

22218824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777359 (or 2777355 counting only the distinct ones).

The product of its digits is 4096, while the sum is 29.

The square root of 22218824 is about 4713.6847582332. The cubic root of 22218824 is about 281.1298901786.

The spelling of 22218824 in words is "twenty-two million, two hundred eighteen thousand, eight hundred twenty-four".