20689120 has 48 divisors (see below), whose sum is σ = 49206528. Its totient is φ = 8220160.

The previous prime is 20689111. The next prime is 20689139. The reversal of 20689120 is 2198602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30222 + ... + 30898.

It is an arithmetic number, because the mean of its divisors is an integer number (1025136).

Almost surely, 2^20689120 is an apocalyptic number.

20689120 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 20689120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24603264).

20689120 is an abundant number, since it is smaller than the sum of its proper divisors (28517408).

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

20689120 is a wasteful number, since it uses less digits than its factorization.

20689120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20689120 is about 4548.5294326848. The cubic root of 20689120 is about 274.5242241698.

The spelling of 20689120 in words is "twenty million, six hundred eighty-nine thousand, one hundred twenty".