18320620 has 12 divisors (see below), whose sum is σ = 38473344. Its totient is φ = 7328240.

The previous prime is 18320609. The next prime is 18320629. The reversal of 18320620 is 2602381.

It is a junction number, because it is equal to n+sod(n) for n = 18320591 and 18320600.

It is not an unprimeable number, because it can be changed into a prime (18320629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457996 + ... + 458035.

It is an arithmetic number, because the mean of its divisors is an integer number (3206112).

Almost surely, 2^18320620 is an apocalyptic number.

18320620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18320620 is an abundant number, since it is smaller than the sum of its proper divisors (20152724).

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

18320620 is a wasteful number, since it uses less digits than its factorization.

18320620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916040 (or 916038 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18320620 is about 4280.2593379374. The cubic root of 18320620 is about 263.6210318616.

The spelling of 18320620 in words is "eighteen million, three hundred twenty thousand, six hundred twenty".