20481605 has 8 divisors (see below), whose sum is σ = 24603264. Its totient is φ = 16368400.

The previous prime is 20481599. The next prime is 20481623. The reversal of 20481605 is 50618402.

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

It is not a de Polignac number, because 20481605 - 2⁶ = 20481541 is a prime.

It is a super-3 number, since 3×20481605³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6200 + ... + 8910.

It is an arithmetic number, because the mean of its divisors is an integer number (3075408).

Almost surely, 2^20481605 is an apocalyptic number.

It is an amenable number.

20481605 is a deficient number, since it is larger than the sum of its proper divisors (4121659).

20481605 is a wasteful number, since it uses less digits than its factorization.

20481605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20481605 is about 4525.6607252422. The cubic root of 20481605 is about 273.6032984467.

The spelling of 20481605 in words is "twenty million, four hundred eighty-one thousand, six hundred five".