20766208 has 20 divisors (see below), whose sum is σ = 41492880. Its totient is φ = 10382848.

The previous prime is 20766203. The next prime is 20766211. The reversal of 20766208 is 80266702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20766208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19768 + ... + 20791.

It is an arithmetic number, because the mean of its divisors is an integer number (2074644).

Almost surely, 2^20766208 is an apocalyptic number.

It is an amenable number.

20766208 is a deficient number, since it is larger than the sum of its proper divisors (20726672).

20766208 is an frugal number, since it uses more digits than its factorization.

20766208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40577 (or 40561 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20766208 is about 4556.9955014242. The cubic root of 20766208 is about 274.8647621546.

The spelling of 20766208 in words is "twenty million, seven hundred sixty-six thousand, two hundred eight".