20155120 has 20 divisors (see below), whose sum is σ = 46860840. Its totient is φ = 8062016.

The previous prime is 20155117. The next prime is 20155127. The reversal of 20155120 is 2155102.

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 (16).

It is a junction number, because it is equal to n+sod(n) for n = 20155094 and 20155103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125890 + ... + 126049.

It is an arithmetic number, because the mean of its divisors is an integer number (2343042).

Almost surely, 2^20155120 is an apocalyptic number.

20155120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155120 is an abundant number, since it is smaller than the sum of its proper divisors (26705720).

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

20155120 is a wasteful number, since it uses less digits than its factorization.

20155120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251952 (or 251946 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20155120 is about 4489.4454000466. The cubic root of 20155120 is about 272.1417225687.

The spelling of 20155120 in words is "twenty million, one hundred fifty-five thousand, one hundred twenty".