20686120 has 64 divisors (see below), whose sum is σ = 57294720. Its totient is φ = 6545664.

The previous prime is 20686111. The next prime is 20686147. The reversal of 20686120 is 2168602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (895230).

Almost surely, 2^20686120 is an apocalyptic number.

20686120 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 20686120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28647360).

20686120 is an abundant number, since it is smaller than the sum of its proper divisors (36608600).

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

20686120 is a wasteful number, since it uses less digits than its factorization.

20686120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714 (or 5710 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20686120 is about 4548.1996438151. The cubic root of 20686120 is about 274.5109545143.

The spelling of 20686120 in words is "twenty million, six hundred eighty-six thousand, one hundred twenty".