20656413 has 12 divisors (see below), whose sum is σ = 29877120. Its totient is φ = 13752456.

The previous prime is 20656409. The next prime is 20656429. The reversal of 20656413 is 31465602.

20656413 is a `hidden beast` number, since 2 + 0 + 656 + 4 + 1 + 3 = 666.

It is not a de Polignac number, because 20656413 - 2² = 20656409 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10420 + ... + 12242.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^20656413 is an apocalyptic number.

It is an amenable number.

20656413 is a deficient number, since it is larger than the sum of its proper divisors (9220707).

20656413 is a wasteful number, since it uses less digits than its factorization.

20656413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088 (or 3085 counting only the distinct ones).

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

The square root of 20656413 is about 4544.9326727687. The cubic root of 20656413 is about 274.3794846568.

The spelling of 20656413 in words is "twenty million, six hundred fifty-six thousand, four hundred thirteen".