20665413 has 24 divisors (see below), whose sum is σ = 31039008. Its totient is φ = 13239072.

The previous prime is 20665367. The next prime is 20665433. The reversal of 20665413 is 31456602.

20665413 is a `hidden beast` number, since 2 + 0 + 6 + 654 + 1 + 3 = 666.

It is not a de Polignac number, because 20665413 - 2¹⁷ = 20534341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25531 + ... + 26327.

It is an arithmetic number, because the mean of its divisors is an integer number (1293292).

Almost surely, 2^20665413 is an apocalyptic number.

It is an amenable number.

20665413 is a deficient number, since it is larger than the sum of its proper divisors (10373595).

20665413 is a wasteful number, since it uses less digits than its factorization.

20665413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20665413 is about 4545.9226786209. The cubic root of 20665413 is about 274.4193279217.

The spelling of 20665413 in words is "twenty million, six hundred sixty-five thousand, four hundred thirteen".