16820550 has 36 divisors (see below), whose sum is σ = 45192420. Its totient is φ = 4485360.

The previous prime is 16820549. The next prime is 16820561. The reversal of 16820550 is 5502861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18240 + ... + 19139.

It is an arithmetic number, because the mean of its divisors is an integer number (1255345).

Almost surely, 2^16820550 is an apocalyptic number.

16820550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16820550 is an abundant number, since it is smaller than the sum of its proper divisors (28371870).

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

16820550 is a wasteful number, since it uses less digits than its factorization.

16820550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37397 (or 37389 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 16820550 is about 4101.2863835631. The cubic root of 16820550 is about 256.2202186290.

The spelling of 16820550 in words is "sixteen million, eight hundred twenty thousand, five hundred fifty".