18220680 has 64 divisors (see below), whose sum is σ = 60739200. Its totient is φ = 4858560.

The previous prime is 18220679. The next prime is 18220693. The reversal of 18220680 is 8602281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7356 + ... + 9515.

It is an arithmetic number, because the mean of its divisors is an integer number (949050).

Almost surely, 2^18220680 is an apocalyptic number.

18220680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18220680 is an abundant number, since it is smaller than the sum of its proper divisors (42518520).

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

18220680 is a wasteful number, since it uses less digits than its factorization.

18220680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16891 (or 16881 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18220680 is about 4268.5688468151. The cubic root of 18220680 is about 263.1408017810.

The spelling of 18220680 in words is "eighteen million, two hundred twenty thousand, six hundred eighty".