20456666 has 8 divisors (see below), whose sum is σ = 30802464. Its totient is φ = 10189180.

The previous prime is 20456651. The next prime is 20456669. The reversal of 20456666 is 66665402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20456669) 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 in 3 ways as a sum of consecutive naturals, for example, 18920 + ... + 19971.

It is an arithmetic number, because the mean of its divisors is an integer number (3850308).

Almost surely, 2^20456666 is an apocalyptic number.

20456666 is a deficient number, since it is larger than the sum of its proper divisors (10345798).

20456666 is a wasteful number, since it uses less digits than its factorization.

20456666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39156.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 20456666 is about 4522.9045977115. The cubic root of 20456666 is about 273.4922042235.

The spelling of 20456666 in words is "twenty million, four hundred fifty-six thousand, six hundred sixty-six".