16782220 has 48 divisors (see below), whose sum is σ = 43380288. Its totient is φ = 5310720.

The previous prime is 16782209. The next prime is 16782277. The reversal of 16782220 is 2228761.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 6430.

It is an arithmetic number, because the mean of its divisors is an integer number (903756).

Almost surely, 2^16782220 is an apocalyptic number.

16782220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16782220 is an abundant number, since it is smaller than the sum of its proper divisors (26598068).

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

16782220 is a wasteful number, since it uses less digits than its factorization.

16782220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250 (or 9248 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 16782220 is about 4096.6107943030. The cubic root of 16782220 is about 256.0254491302.

The spelling of 16782220 in words is "sixteen million, seven hundred eighty-two thousand, two hundred twenty".