20055140 has 48 divisors (see below), whose sum is σ = 49695744. Its totient is φ = 6652800.

The previous prime is 20055137. The next prime is 20055143. The reversal of 20055140 is 4155002.

It is an interprime number because it is at equal distance from previous prime (20055137) and next prime (20055143).

It is not an unprimeable number, because it can be changed into a prime (20055143) 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, 2030 + ... + 6650.

It is an arithmetic number, because the mean of its divisors is an integer number (1035328).

Almost surely, 2^20055140 is an apocalyptic number.

20055140 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 20055140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24847872).

20055140 is an abundant number, since it is smaller than the sum of its proper divisors (29640604).

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

20055140 is a wasteful number, since it uses less digits than its factorization.

20055140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668 (or 4666 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20055140 is about 4478.2965511453. The cubic root of 20055140 is about 271.6909877398.

The spelling of 20055140 in words is "twenty million, fifty-five thousand, one hundred forty".