20655912 has 16 divisors (see below), whose sum is σ = 51639840. Its totient is φ = 6885296.

The previous prime is 20655871. The next prime is 20655919. The reversal of 20655912 is 21955602.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20655912.

It is not an unprimeable number, because it can be changed into a prime (20655919) 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 3 ways as a sum of consecutive naturals, for example, 430308 + ... + 430355.

It is an arithmetic number, because the mean of its divisors is an integer number (3227490).

Almost surely, 2^20655912 is an apocalyptic number.

It is an amenable number.

20655912 is an abundant number, since it is smaller than the sum of its proper divisors (30983928).

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

20655912 is a wasteful number, since it uses less digits than its factorization.

20655912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860672 (or 860668 counting only the distinct ones).

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

The square root of 20655912 is about 4544.8775561064. The cubic root of 20655912 is about 274.3772663750.

The spelling of 20655912 in words is "twenty million, six hundred fifty-five thousand, nine hundred twelve".