16842820 has 12 divisors (see below), whose sum is σ = 35369964. Its totient is φ = 6737120.

The previous prime is 16842809. The next prime is 16842821. The reversal of 16842820 is 2824861.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 10771524 = 2464^2 + 3282^2 .

It is a super-3 number, since 3×16842820³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16842821) 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, 421051 + ... + 421090.

It is an arithmetic number, because the mean of its divisors is an integer number (2947497).

Almost surely, 2^16842820 is an apocalyptic number.

16842820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16842820 is an abundant number, since it is smaller than the sum of its proper divisors (18527144).

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

16842820 is a wasteful number, since it uses less digits than its factorization.

16842820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842150 (or 842148 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 16842820 is about 4104.0004873294. Note that the first 3 decimals coincide. The cubic root of 16842820 is about 256.3332452127. Note that the first 3 decimals are identical.

The spelling of 16842820 in words is "sixteen million, eight hundred forty-two thousand, eight hundred twenty".