20416538 has 8 divisors (see below), whose sum is σ = 31612800. Its totient is φ = 9878940.

The previous prime is 20416457. The next prime is 20416549. The reversal of 20416538 is 83561402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20416538.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 164588 + ... + 164711.

It is an arithmetic number, because the mean of its divisors is an integer number (3951600).

Almost surely, 2^20416538 is an apocalyptic number.

20416538 is a deficient number, since it is larger than the sum of its proper divisors (11196262).

20416538 is a wasteful number, since it uses less digits than its factorization.

20416538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329332.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20416538 is about 4518.4663327284. The cubic root of 20416538 is about 273.3132588205.

The spelling of 20416538 in words is "twenty million, four hundred sixteen thousand, five hundred thirty-eight".