20225666 has 8 divisors (see below), whose sum is σ = 30417660. Its totient is φ = 10086448.

The previous prime is 20225657. The next prime is 20225677. The reversal of 20225666 is 66652202.

It can be written as a sum of positive squares in 2 ways, for example, as 17598025 + 2627641 = 4195^2 + 1621^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12221 + ... + 13776.

Almost surely, 2^20225666 is an apocalyptic number.

20225666 is a deficient number, since it is larger than the sum of its proper divisors (10191994).

20225666 is a wasteful number, since it uses less digits than its factorization.

20225666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26388.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20225666 is about 4497.2954094656. The cubic root of 20225666 is about 272.4588653786.

Adding to 20225666 its reverse (66652202), we get a palindrome (86877868).

The spelling of 20225666 in words is "twenty million, two hundred twenty-five thousand, six hundred sixty-six".