16820016 has 40 divisors (see below), whose sum is σ = 45741120. Its totient is φ = 5311296.

The previous prime is 16819993. The next prime is 16820017. The reversal of 16820016 is 61002861.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (16820017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8310 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (1143528).

Almost surely, 2^16820016 is an apocalyptic number.

16820016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16820016 is an abundant number, since it is smaller than the sum of its proper divisors (28921104).

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

16820016 is a wasteful number, since it uses less digits than its factorization.

16820016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473 (or 18467 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 16820016 is about 4101.2212815209. The cubic root of 16820016 is about 256.2175072027.

Adding to 16820016 its reverse (61002861), we get a palindrome (77822877).

The spelling of 16820016 in words is "sixteen million, eight hundred twenty thousand, sixteen".