16987920 has 40 divisors (see below), whose sum is σ = 52663296. Its totient is φ = 4530048.

The previous prime is 16987909. The next prime is 16987963. The reversal of 16987920 is 2978961.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35152 + ... + 35631.

Almost surely, 2^16987920 is an apocalyptic number.

16987920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16987920 is an abundant number, since it is smaller than the sum of its proper divisors (35675376).

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

16987920 is a wasteful number, since it uses less digits than its factorization.

16987920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70799 (or 70793 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 16987920 is about 4121.6404501121. The cubic root of 16987920 is about 257.0672405526.

The spelling of 16987920 in words is "sixteen million, nine hundred eighty-seven thousand, nine hundred twenty".