20555188 has 12 divisors (see below), whose sum is σ = 37864960. Its totient is φ = 9736632.

The previous prime is 20555167. The next prime is 20555191. The reversal of 20555188 is 88155502.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 135156 + ... + 135307.

Almost surely, 2^20555188 is an apocalyptic number.

It is an amenable number.

20555188 is a deficient number, since it is larger than the sum of its proper divisors (17309772).

20555188 is a wasteful number, since it uses less digits than its factorization.

20555188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270486 (or 270484 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 20555188 is about 4533.7829678978. The cubic root of 20555188 is about 273.9305594183.

The spelling of 20555188 in words is "twenty million, five hundred fifty-five thousand, one hundred eighty-eight".