18206720 has 104 divisors (see below), whose sum is σ = 50325504. Its totient is φ = 6193152.

The previous prime is 18206707. The next prime is 18206723. The reversal of 18206720 is 2760281.

It is a self number, because there is not a number n which added to its sum of digits gives 18206720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18206723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143297 + ... + 143423.

Almost surely, 2^18206720 is an apocalyptic number.

18206720 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 18206720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25162752).

18206720 is an abundant number, since it is smaller than the sum of its proper divisors (32118784).

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

18206720 is an equidigital number, since it uses as much as digits as its factorization.

18206720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18206720 is about 4266.9333250005. The cubic root of 18206720 is about 263.0735817478.

The spelling of 18206720 in words is "eighteen million, two hundred six thousand, seven hundred twenty".