20223556 has 24 divisors (see below), whose sum is σ = 36794520. Its totient is φ = 9714432.

The previous prime is 20223551. The next prime is 20223611. The reversal of 20223556 is 65532202.

It can be written as a sum of positive squares in 4 ways, for example, as 722500 + 19501056 = 850^2 + 4416^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20223556.

It is not an unprimeable number, because it can be changed into a prime (20223551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36030 + ... + 36586.

It is an arithmetic number, because the mean of its divisors is an integer number (1533105).

Almost surely, 2^20223556 is an apocalyptic number.

It is an amenable number.

20223556 is a deficient number, since it is larger than the sum of its proper divisors (16570964).

20223556 is a wasteful number, since it uses less digits than its factorization.

20223556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20223556 is about 4497.0608179121. The cubic root of 20223556 is about 272.4493904834.

Adding to 20223556 its reverse (65532202), we get a palindrome (85755758).

The spelling of 20223556 in words is "twenty million, two hundred twenty-three thousand, five hundred fifty-six".