20966455 has 16 divisors (see below), whose sum is σ = 26380224. Its totient is φ = 15966720.

The previous prime is 20966431. The next prime is 20966459. The reversal of 20966455 is 55466902.

It is a de Polignac number, because none of the positive numbers 2^k-20966455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20966459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38485 + ... + 39025.

It is an arithmetic number, because the mean of its divisors is an integer number (1648764).

Almost surely, 2^20966455 is an apocalyptic number.

20966455 is a deficient number, since it is larger than the sum of its proper divisors (5413769).

20966455 is a wasteful number, since it uses less digits than its factorization.

20966455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 20966455 is about 4578.9141725959. The cubic root of 20966455 is about 275.7454375850.

The spelling of 20966455 in words is "twenty million, nine hundred sixty-six thousand, four hundred fifty-five".