20666708 has 12 divisors (see below), whose sum is σ = 37333632. Its totient is φ = 9999960.

The previous prime is 20666689. The next prime is 20666743. The reversal of 20666708 is 80766602.

It is a super-2 number, since 2×20666708² = 854225639114528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 83210 + ... + 83457.

It is an arithmetic number, because the mean of its divisors is an integer number (3111136).

Almost surely, 2^20666708 is an apocalyptic number.

It is an amenable number.

20666708 is a deficient number, since it is larger than the sum of its proper divisors (16666924).

20666708 is a wasteful number, since it uses less digits than its factorization.

20666708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166702 (or 166700 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20666708 is about 4546.0651117202. The cubic root of 20666708 is about 274.4250599728.

The spelling of 20666708 in words is "twenty million, six hundred sixty-six thousand, seven hundred eight".