16820340 has 24 divisors (see below), whose sum is σ = 47097120. Its totient is φ = 4485408.

The previous prime is 16820333. The next prime is 16820341. The reversal of 16820340 is 4302861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16820340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16820341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140110 + ... + 140229.

It is an arithmetic number, because the mean of its divisors is an integer number (1962380).

Almost surely, 2^16820340 is an apocalyptic number.

16820340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16820340 is an abundant number, since it is smaller than the sum of its proper divisors (30276780).

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

16820340 is a wasteful number, since it uses less digits than its factorization.

16820340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280351 (or 280349 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16820340 is about 4101.2607817597. The cubic root of 16820340 is about 256.2191523446.

The spelling of 16820340 in words is "sixteen million, eight hundred twenty thousand, three hundred forty".