16620281 has 8 divisors (see below), whose sum is σ = 17068800. Its totient is φ = 16175808.

The previous prime is 16620239. The next prime is 16620301. The reversal of 16620281 is 18202661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16620281 - 2¹⁴ = 16603897 is a prime.

It is a super-2 number, since 2×16620281² = 552467481037922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16620281.

It is not an unprimeable number, because it can be changed into a prime (16620481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8465 + ... + 10241.

It is an arithmetic number, because the mean of its divisors is an integer number (2133600).

Almost surely, 2^16620281 is an apocalyptic number.

It is an amenable number.

16620281 is a deficient number, since it is larger than the sum of its proper divisors (448519).

16620281 is a wasteful number, since it uses less digits than its factorization.

16620281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 16620281 is about 4076.7978855960. The cubic root of 16620281 is about 255.1992854561.

The spelling of 16620281 in words is "sixteen million, six hundred twenty thousand, two hundred eighty-one".