20455284 has 24 divisors (see below), whose sum is σ = 50537088. Its totient is φ = 6417280.

The previous prime is 20455283. The next prime is 20455289. The reversal of 20455284 is 48255402.

20455284 is a modest number, since divided by 55284 gives 204 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20455283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49932 + ... + 50339.

It is an arithmetic number, because the mean of its divisors is an integer number (2105712).

Almost surely, 2^20455284 is an apocalyptic number.

It is an amenable number.

20455284 is an abundant number, since it is smaller than the sum of its proper divisors (30081804).

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

20455284 is a wasteful number, since it uses less digits than its factorization.

20455284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100295 (or 100293 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 20455284 is about 4522.7518172016. The cubic root of 20455284 is about 273.4860452737.

The spelling of 20455284 in words is "twenty million, four hundred fifty-five thousand, two hundred eighty-four".