16856020 has 12 divisors (see below), whose sum is σ = 35397684. Its totient is φ = 6742400.

The previous prime is 16856017. The next prime is 16856023. The reversal of 16856020 is 2065861.

It is an interprime number because it is at equal distance from previous prime (16856017) and next prime (16856023).

It can be written as a sum of positive squares in 2 ways, for example, as 4787344 + 12068676 = 2188^2 + 3474^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16856020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16856023) 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, 421381 + ... + 421420.

It is an arithmetic number, because the mean of its divisors is an integer number (2949807).

Almost surely, 2^16856020 is an apocalyptic number.

16856020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16856020 is an abundant number, since it is smaller than the sum of its proper divisors (18541664).

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

16856020 is a wasteful number, since it uses less digits than its factorization.

16856020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842810 (or 842808 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 16856020 is about 4105.6083593056. The cubic root of 16856020 is about 256.4001919451.

The spelling of 16856020 in words is "sixteen million, eight hundred fifty-six thousand, twenty".