20906775 has 48 divisors (see below), whose sum is σ = 39283200. Its totient is φ = 10896480.

The previous prime is 20906773. The next prime is 20906789. The reversal of 20906775 is 57760902.

It is not a de Polignac number, because 20906775 - 2¹ = 20906773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906771) 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 47 ways as a sum of consecutive naturals, for example, 31396 + ... + 32054.

It is an arithmetic number, because the mean of its divisors is an integer number (818400).

Almost surely, 2^20906775 is an apocalyptic number.

20906775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20906775 is a deficient number, since it is larger than the sum of its proper divisors (18376425).

20906775 is a wasteful number, since it uses less digits than its factorization.

20906775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 20906775 is about 4572.3926996705. The cubic root of 20906775 is about 275.4835569340.

The spelling of 20906775 in words is "twenty million, nine hundred six thousand, seven hundred seventy-five".