18916020 has 72 divisors (see below), whose sum is σ = 60409440. Its totient is φ = 4777920.

The previous prime is 18915989. The next prime is 18916031. The reversal of 18916020 is 2061981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 655 + ... + 6185.

It is an arithmetic number, because the mean of its divisors is an integer number (839020).

Almost surely, 2^18916020 is an apocalyptic number.

18916020 is a gapful number since it is divisible by the number (10) 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 18916020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30204720).

18916020 is an abundant number, since it is smaller than the sum of its proper divisors (41493420).

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

18916020 is a wasteful number, since it uses less digits than its factorization.

18916020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565 (or 5560 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18916020 is about 4349.2551086364. The cubic root of 18916020 is about 266.4464397032.

The spelling of 18916020 in words is "eighteen million, nine hundred sixteen thousand, twenty".