20655445 has 4 divisors (see below), whose sum is σ = 24786540. Its totient is φ = 16524352.

The previous prime is 20655433. The next prime is 20655457. The reversal of 20655445 is 54455602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20655433) and next prime (20655457).

It can be written as a sum of positive squares in 2 ways, for example, as 8538084 + 12117361 = 2922^2 + 3481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20655445 - 2¹⁵ = 20622677 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065540 + ... + 2065549.

It is an arithmetic number, because the mean of its divisors is an integer number (6196635).

Almost surely, 2^20655445 is an apocalyptic number.

It is an amenable number.

20655445 is a deficient number, since it is larger than the sum of its proper divisors (4131095).

20655445 is an equidigital number, since it uses as much as digits as its factorization.

20655445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131094.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 20655445 is about 4544.8261792944. The cubic root of 20655445 is about 274.3751986030.

The spelling of 20655445 in words is "twenty million, six hundred fifty-five thousand, four hundred forty-five".