20227645 has 8 divisors (see below), whose sum is σ = 25110360. Its totient is φ = 15624000.

The previous prime is 20227633. The next prime is 20227651. The reversal of 20227645 is 54672202.

It can be written as a sum of positive squares in 4 ways, for example, as 6255001 + 13972644 = 2501^2 + 3738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20227645 - 2⁷ = 20227517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69606 + ... + 69895.

It is an arithmetic number, because the mean of its divisors is an integer number (3138795).

Almost surely, 2^20227645 is an apocalyptic number.

It is an amenable number.

20227645 is a deficient number, since it is larger than the sum of its proper divisors (4882715).

20227645 is a wasteful number, since it uses less digits than its factorization.

20227645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139535.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20227645 is about 4497.5154252098. The cubic root of 20227645 is about 272.4677514232.

Adding to 20227645 its reverse (54672202), we get a palindrome (74899847).

The spelling of 20227645 in words is "twenty million, two hundred twenty-seven thousand, six hundred forty-five".