16809020 has 12 divisors (see below), whose sum is σ = 35298984. Its totient is φ = 6723600.

The previous prime is 16809019. The next prime is 16809031. The reversal of 16809020 is 2090861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420206 + ... + 420245.

It is an arithmetic number, because the mean of its divisors is an integer number (2941582).

Almost surely, 2^16809020 is an apocalyptic number.

16809020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16809020 is an abundant number, since it is smaller than the sum of its proper divisors (18489964).

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

16809020 is a wasteful number, since it uses less digits than its factorization.

16809020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840460 (or 840458 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 16809020 is about 4099.8804860630. The cubic root of 16809020 is about 256.1616614001.

Adding to 16809020 its reverse (2090861), we get a palindrome (18899881).

The spelling of 16809020 in words is "sixteen million, eight hundred nine thousand, twenty".