20538120 has 64 divisors (see below), whose sum is σ = 63613440. Its totient is φ = 5299200.

The previous prime is 20538109. The next prime is 20538127. The reversal of 20538120 is 2183502.

It is not an unprimeable number, because it can be changed into a prime (20538127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (993960).

Almost surely, 2^20538120 is an apocalyptic number.

20538120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20538120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31806720).

20538120 is an abundant number, since it is smaller than the sum of its proper divisors (43075320).

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

20538120 is a wasteful number, since it uses less digits than its factorization.

20538120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566 (or 5562 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20538120 is about 4531.9002636863. The cubic root of 20538120 is about 273.8547190113.

The spelling of 20538120 in words is "twenty million, five hundred thirty-eight thousand, one hundred twenty".