20668550 has 24 divisors (see below), whose sum is σ = 43936176. Its totient is φ = 7086240.

The previous prime is 20668541. The next prime is 20668553. The reversal of 20668550 is 5586602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 29177 + ... + 29876.

It is an arithmetic number, because the mean of its divisors is an integer number (1830674).

Almost surely, 2^20668550 is an apocalyptic number.

20668550 is an abundant number, since it is smaller than the sum of its proper divisors (23267626).

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

20668550 is a wasteful number, since it uses less digits than its factorization.

20668550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59072 (or 59067 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 20668550 is about 4546.2676999930. The cubic root of 20668550 is about 274.4332127943.

The spelling of 20668550 in words is "twenty million, six hundred sixty-eight thousand, five hundred fifty".