16216820 has 24 divisors (see below), whose sum is σ = 34166664. Its totient is φ = 6465536.

The previous prime is 16216819. The next prime is 16216831. The reversal of 16216820 is 2861261.

It can be written as a sum of positive squares in 4 ways, for example, as 1069156 + 15147664 = 1034^2 + 3892^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16216820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5912 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (1423611).

Almost surely, 2^16216820 is an apocalyptic number.

16216820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16216820 is an abundant number, since it is smaller than the sum of its proper divisors (17949844).

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

16216820 is a wasteful number, since it uses less digits than its factorization.

16216820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659 (or 2657 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 16216820 is about 4027.0112987177. The cubic root of 16216820 is about 253.1173405191.

The spelling of 16216820 in words is "sixteen million, two hundred sixteen thousand, eight hundred twenty".