20641766 has 8 divisors (see below), whose sum is σ = 31247040. Its totient is φ = 10226088.

The previous prime is 20641739. The next prime is 20641769. The reversal of 20641766 is 66714602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47126 + ... + 47561.

It is an arithmetic number, because the mean of its divisors is an integer number (3905880).

Almost surely, 2^20641766 is an apocalyptic number.

20641766 is a deficient number, since it is larger than the sum of its proper divisors (10605274).

20641766 is a wasteful number, since it uses less digits than its factorization.

20641766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94798.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20641766 is about 4543.3210320205. The cubic root of 20641766 is about 274.3146172058.

The spelling of 20641766 in words is "twenty million, six hundred forty-one thousand, seven hundred sixty-six".