20555872 has 24 divisors (see below), whose sum is σ = 42600600. Its totient is φ = 9736704.

The previous prime is 20555827. The next prime is 20555897. The reversal of 20555872 is 27855502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16297 + ... + 17512.

It is an arithmetic number, because the mean of its divisors is an integer number (1775025).

Almost surely, 2^20555872 is an apocalyptic number.

It is an amenable number.

20555872 is an abundant number, since it is smaller than the sum of its proper divisors (22044728).

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

20555872 is a wasteful number, since it uses less digits than its factorization.

20555872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33838 (or 33830 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 20555872 is about 4533.8584009649. The cubic root of 20555872 is about 273.9335978470.

The spelling of 20555872 in words is "twenty million, five hundred fifty-five thousand, eight hundred seventy-two".