20066805 has 32 divisors (see below), whose sum is σ = 38920320. Its totient is φ = 9728640.

The previous prime is 20066803. The next prime is 20066819. The reversal of 20066805 is 50866002.

It is not a de Polignac number, because 20066805 - 2¹ = 20066803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20066803) 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 31 ways as a sum of consecutive naturals, for example, 5272 + ... + 8241.

It is an arithmetic number, because the mean of its divisors is an integer number (1216260).

Almost surely, 2^20066805 is an apocalyptic number.

It is an amenable number.

20066805 is a deficient number, since it is larger than the sum of its proper divisors (18853515).

20066805 is a wasteful number, since it uses less digits than its factorization.

20066805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13538 (or 13532 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20066805 is about 4479.5987543529. The cubic root of 20066805 is about 271.7436535586.

The spelling of 20066805 in words is "twenty million, sixty-six thousand, eight hundred five".