16820040 has 32 divisors (see below), whose sum is σ = 50460480. Its totient is φ = 4485312.

The previous prime is 16820039. The next prime is 16820047. The reversal of 16820040 is 4002861.

It is a junction number, because it is equal to n+sod(n) for n = 16819989 and 16820016.

It is not an unprimeable number, because it can be changed into a prime (16820047) 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, 69964 + ... + 70203.

It is an arithmetic number, because the mean of its divisors is an integer number (1576890).

Almost surely, 2^16820040 is an apocalyptic number.

16820040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16820040 is an abundant number, since it is smaller than the sum of its proper divisors (33640440).

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

16820040 is a wasteful number, since it uses less digits than its factorization.

16820040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140181 (or 140177 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 16820040 is about 4101.2242074776. The cubic root of 16820040 is about 256.2176290658.

The spelling of 16820040 in words is "sixteen million, eight hundred twenty thousand, forty".