20555216 has 20 divisors (see below), whose sum is σ = 43446624. Its totient is φ = 9343200.

The previous prime is 20555209. The next prime is 20555219. The reversal of 20555216 is 61255502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58220 + ... + 58571.

Almost surely, 2^20555216 is an apocalyptic number.

It is an amenable number.

20555216 is an abundant number, since it is smaller than the sum of its proper divisors (22891408).

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

20555216 is a wasteful number, since it uses less digits than its factorization.

20555216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116810 (or 116804 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 20555216 is about 4533.7860558257. The cubic root of 20555216 is about 273.9306837997.

The spelling of 20555216 in words is "twenty million, five hundred fifty-five thousand, two hundred sixteen".