20226645 has 16 divisors (see below), whose sum is σ = 35958720. Its totient is φ = 10787472.

The previous prime is 20226631. The next prime is 20226649. The reversal of 20226645 is 54662202.

It is not a de Polignac number, because 20226645 - 2⁴ = 20226629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20226649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74779 + ... + 75048.

It is an arithmetic number, because the mean of its divisors is an integer number (2247420).

Almost surely, 2^20226645 is an apocalyptic number.

It is an amenable number.

20226645 is a deficient number, since it is larger than the sum of its proper divisors (15732075).

20226645 is a wasteful number, since it uses less digits than its factorization.

20226645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149841 (or 149835 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20226645 is about 4497.4042513432. The cubic root of 20226645 is about 272.4632613266.

Adding to 20226645 its reverse (54662202), we get a palindrome (74888847).

The spelling of 20226645 in words is "twenty million, two hundred twenty-six thousand, six hundred forty-five".