16820280 has 48 divisors (see below), whose sum is σ = 54667080. Its totient is φ = 4485312.

The previous prime is 16820273. The next prime is 16820281. The reversal of 16820280 is 8202861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16820281) 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 11 ways as a sum of consecutive naturals, for example, 23002 + ... + 23721.

Almost surely, 2^16820280 is an apocalyptic number.

16820280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16820280 is an abundant number, since it is smaller than the sum of its proper divisors (37846800).

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

16820280 is a wasteful number, since it uses less digits than its factorization.

16820280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46740 (or 46733 counting only the distinct ones).

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

The square root of 16820280 is about 4101.2534669293. The cubic root of 16820280 is about 256.2188476903.

The spelling of 16820280 in words is "sixteen million, eight hundred twenty thousand, two hundred eighty".