20445066 has 12 divisors (see below), whose sum is σ = 44297682. Its totient is φ = 6815016.

The previous prime is 20445041. The next prime is 20445071. The reversal of 20445066 is 66054402.

It is a happy number.

20445066 is a `hidden beast` number, since 204 + 450 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 5625 = 4521^2 + 75^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567901 + ... + 567936.

Almost surely, 2^20445066 is an apocalyptic number.

20445066 is an abundant number, since it is smaller than the sum of its proper divisors (23852616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20445066 is a wasteful number, since it uses less digits than its factorization.

20445066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135845 (or 1135842 counting only the distinct ones).

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

The square root of 20445066 is about 4521.6220540863. The cubic root of 20445066 is about 273.4404996525.

Adding to 20445066 its reverse (66054402), we get a palindrome (86499468).

The spelling of 20445066 in words is "twenty million, four hundred forty-five thousand, sixty-six".