20955216 has 40 divisors (see below), whose sum is σ = 54309024. Its totient is φ = 6962560.

The previous prime is 20955199. The next prime is 20955227. The reversal of 20955216 is 61255902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21655 + ... + 22601.

Almost surely, 2^20955216 is an apocalyptic number.

It is an amenable number.

20955216 is an abundant number, since it is smaller than the sum of its proper divisors (33353808).

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

20955216 is a wasteful number, since it uses less digits than its factorization.

20955216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 20955216 is about 4577.6867520616. The cubic root of 20955216 is about 275.6961579636.

The spelling of 20955216 in words is "twenty million, nine hundred fifty-five thousand, two hundred sixteen".