20455506 has 12 divisors (see below), whose sum is σ = 44320302. Its totient is φ = 6818496.

The previous prime is 20455499. The next prime is 20455529. The reversal of 20455506 is 60555402.

It can be written as a sum of positive squares in only one way, i.e., 16475481 + 3980025 = 4059^2 + 1995^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20455506.

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, 568191 + ... + 568226.

Almost surely, 2^20455506 is an apocalyptic number.

20455506 is an abundant number, since it is smaller than the sum of its proper divisors (23864796).

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

20455506 is a wasteful number, since it uses less digits than its factorization.

20455506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136425 (or 1136422 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 20455506 is about 4522.7763597153. The cubic root of 20455506 is about 273.4870346461.

The spelling of 20455506 in words is "twenty million, four hundred fifty-five thousand, five hundred six".