16540020 has 72 divisors (see below), whose sum is σ = 57343104. Its totient is φ = 3780288.

The previous prime is 16540009. The next prime is 16540021. The reversal of 16540020 is 2004561.

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 = 16539975 and 16540002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16540021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5304 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (796432).

Almost surely, 2^16540020 is an apocalyptic number.

16540020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16540020 is an abundant number, since it is smaller than the sum of its proper divisors (40803084).

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

16540020 is a wasteful number, since it uses less digits than its factorization.

16540020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13149 (or 13144 counting only the distinct ones).

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

The square root of 16540020 is about 4066.9423403830. The cubic root of 16540020 is about 254.7878281257.

Adding to 16540020 its reverse (2004561), we get a palindrome (18544581).

The spelling of 16540020 in words is "sixteen million, five hundred forty thousand, twenty".