22640836 has 6 divisors (see below), whose sum is σ = 39621470. Its totient is φ = 11320416.

The previous prime is 22640831. The next prime is 22640857. The reversal of 22640836 is 63804622.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 2119936 = 4530^2 + 1456^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22640798 and 22640807.

It is not an unprimeable number, because it can be changed into a prime (22640831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830101 + ... + 2830108.

Almost surely, 2^22640836 is an apocalyptic number.

It is an amenable number.

22640836 is a deficient number, since it is larger than the sum of its proper divisors (16980634).

22640836 is a wasteful number, since it uses less digits than its factorization.

22640836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660213 (or 5660211 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 22640836 is about 4758.2387497897. The cubic root of 22640836 is about 282.8986139339.

The spelling of 22640836 in words is "twenty-two million, six hundred forty thousand, eight hundred thirty-six".