20555120 has 20 divisors (see below), whose sum is σ = 47790840. Its totient is φ = 8222016.

The previous prime is 20555083. The next prime is 20555141. The reversal of 20555120 is 2155502.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20555092 and 20555101.

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, 128390 + ... + 128549.

It is an arithmetic number, because the mean of its divisors is an integer number (2389542).

Almost surely, 2^20555120 is an apocalyptic number.

20555120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20555120 is an abundant number, since it is smaller than the sum of its proper divisors (27235720).

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

20555120 is a wasteful number, since it uses less digits than its factorization.

20555120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256952 (or 256946 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20555120 is about 4533.7754686354. The cubic root of 20555120 is about 273.9302573486.

The spelling of 20555120 in words is "twenty million, five hundred fifty-five thousand, one hundred twenty".