16540420 has 24 divisors (see below), whose sum is σ = 37407384. Its totient is φ = 6107136.

The previous prime is 16540417. The next prime is 16540429. The reversal of 16540420 is 2404561.

It can be written as a sum of positive squares in 4 ways, for example, as 412164 + 16128256 = 642^2 + 4016^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16540391 and 16540400.

It is not an unprimeable number, because it can be changed into a prime (16540429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31549 + ... + 32068.

It is an arithmetic number, because the mean of its divisors is an integer number (1558641).

Almost surely, 2^16540420 is an apocalyptic number.

16540420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16540420 is an abundant number, since it is smaller than the sum of its proper divisors (20866964).

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

16540420 is a wasteful number, since it uses less digits than its factorization.

16540420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63639 (or 63637 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 16540420 is about 4066.9915170799. The cubic root of 16540420 is about 254.7898820190.

Adding to 16540420 its reverse (2404561), we get a palindrome (18944981).

The spelling of 16540420 in words is "sixteen million, five hundred forty thousand, four hundred twenty".