18289620 has 144 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 4451328.

The previous prime is 18289619. The next prime is 18289643. The reversal of 18289620 is 2698281.

18289620 is a `hidden beast` number, since 1 + 8 + 28 + 9 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131511 + ... + 131649.

It is an arithmetic number, because the mean of its divisors is an integer number (420420).

Almost surely, 2^18289620 is an apocalyptic number.

18289620 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 18289620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30270240).

18289620 is an abundant number, since it is smaller than the sum of its proper divisors (42250860).

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

18289620 is a wasteful number, since it uses less digits than its factorization.

18289620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18289620 is about 4276.6365288624. The cubic root of 18289620 is about 263.4722584085.

The spelling of 18289620 in words is "eighteen million, two hundred eighty-nine thousand, six hundred twenty".