16420816 has 20 divisors (see below), whose sum is σ = 31928512. Its totient is φ = 8181216.

The previous prime is 16420777. The next prime is 16420819. The reversal of 16420816 is 61802461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420819) 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, 3241 + ... + 6583.

Almost surely, 2^16420816 is an apocalyptic number.

16420816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16420816 is a deficient number, since it is larger than the sum of its proper divisors (15507696).

16420816 is a wasteful number, since it uses less digits than its factorization.

16420816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658 (or 3652 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 16420816 is about 4052.2606036631. The cubic root of 16420816 is about 254.1742660931.

The spelling of 16420816 in words is "sixteen million, four hundred twenty thousand, eight hundred sixteen".