16020820 has 24 divisors (see below), whose sum is σ = 33957000. Its totient is φ = 6348672.

The previous prime is 16020803. The next prime is 16020827. The reversal of 16020820 is 2802061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3952144 + 12068676 = 1988^2 + 3474^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16020827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 5854.

It is an arithmetic number, because the mean of its divisors is an integer number (1414875).

Almost surely, 2^16020820 is an apocalyptic number.

16020820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16020820 is an abundant number, since it is smaller than the sum of its proper divisors (17936180).

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

16020820 is a wasteful number, since it uses less digits than its factorization.

16020820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7467 (or 7465 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 16020820 is about 4002.6016539246. The cubic root of 16020820 is about 252.0934607562.

Adding to 16020820 its reverse (2802061), we get a palindrome (18822881).

The spelling of 16020820 in words is "sixteen million, twenty thousand, eight hundred twenty".