20256413 has 16 divisors (see below), whose sum is σ = 22344000. Its totient is φ = 18289152.

The previous prime is 20256407. The next prime is 20256433. The reversal of 20256413 is 31465202.

It is a cyclic number.

It is not a de Polignac number, because 20256413 - 2⁶ = 20256349 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 (20256403) 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 15 ways as a sum of consecutive naturals, for example, 53258 + ... + 53636.

It is an arithmetic number, because the mean of its divisors is an integer number (1396500).

Almost surely, 2^20256413 is an apocalyptic number.

It is an amenable number.

20256413 is a deficient number, since it is larger than the sum of its proper divisors (2087587).

20256413 is a wasteful number, since it uses less digits than its factorization.

20256413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20256413 is about 4500.7124991494. The cubic root of 20256413 is about 272.5968592073.

The spelling of 20256413 in words is "twenty million, two hundred fifty-six thousand, four hundred thirteen".