16420647 has 4 divisors (see below), whose sum is σ = 21894200. Its totient is φ = 10947096.

The previous prime is 16420601. The next prime is 16420661. The reversal of 16420647 is 74602461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16420647 - 2⁷ = 16420519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2736772 + ... + 2736777.

It is an arithmetic number, because the mean of its divisors is an integer number (5473550).

Almost surely, 2^16420647 is an apocalyptic number.

16420647 is a deficient number, since it is larger than the sum of its proper divisors (5473553).

16420647 is an equidigital number, since it uses as much as digits as its factorization.

16420647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5473552.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 16420647 is about 4052.2397510513. The cubic root of 16420647 is about 254.1733941186.

The spelling of 16420647 in words is "sixteen million, four hundred twenty thousand, six hundred forty-seven".