20555206 has 24 divisors (see below), whose sum is σ = 36152136. Its totient is φ = 8739360.

The previous prime is 20555203. The next prime is 20555209. The reversal of 20555206 is 60255502.

It is an interprime number because it is at equal distance from previous prime (20555203) and next prime (20555209).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555203) 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 11 ways as a sum of consecutive naturals, for example, 12661 + ... + 14191.

It is an arithmetic number, because the mean of its divisors is an integer number (1506339).

Almost surely, 2^20555206 is an apocalyptic number.

20555206 is a deficient number, since it is larger than the sum of its proper divisors (15596930).

20555206 is a wasteful number, since it uses less digits than its factorization.

20555206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20555206 is about 4533.7849529946. The cubic root of 20555206 is about 273.9306393778.

The spelling of 20555206 in words is "twenty million, five hundred fifty-five thousand, two hundred six".