20413605 has 16 divisors (see below), whose sum is σ = 33422400. Its totient is φ = 10633728.

The previous prime is 20413597. The next prime is 20413607. The reversal of 20413605 is 50631402.

It is a happy number.

It is not a de Polignac number, because 20413605 - 2³ = 20413597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15180 + ... + 16469.

It is an arithmetic number, because the mean of its divisors is an integer number (2088900).

Almost surely, 2^20413605 is an apocalyptic number.

It is an amenable number.

20413605 is a deficient number, since it is larger than the sum of its proper divisors (13008795).

20413605 is a wasteful number, since it uses less digits than its factorization.

20413605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31700.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20413605 is about 4518.1417640442. The cubic root of 20413605 is about 273.3001703106.

The spelling of 20413605 in words is "twenty million, four hundred thirteen thousand, six hundred five".