16504020 has 96 divisors (see below), whose sum is σ = 55319040. Its totient is φ = 4060800.

The previous prime is 16503953. The next prime is 16504049. The reversal of 16504020 is 2040561.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 16503984 and 16504002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5845 + ... + 8195.

It is an arithmetic number, because the mean of its divisors is an integer number (576240).

Almost surely, 2^16504020 is an apocalyptic number.

16504020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16504020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27659520).

16504020 is an abundant number, since it is smaller than the sum of its proper divisors (38815020).

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

16504020 is a wasteful number, since it uses less digits than its factorization.

16504020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 16504020 is about 4062.5139999759. The cubic root of 16504020 is about 254.6028419621.

Adding to 16504020 its reverse (2040561), we get a palindrome (18544581).

The spelling of 16504020 in words is "sixteen million, five hundred four thousand, twenty".