20641718 has 8 divisors (see below), whose sum is σ = 32308848. Its totient is φ = 9872104.

The previous prime is 20641717. The next prime is 20641721. The reversal of 20641718 is 81714602.

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 (20641717) 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, 224321 + ... + 224412.

It is an arithmetic number, because the mean of its divisors is an integer number (4038606).

Almost surely, 2^20641718 is an apocalyptic number.

20641718 is a deficient number, since it is larger than the sum of its proper divisors (11667130).

20641718 is a wasteful number, since it uses less digits than its factorization.

20641718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448758.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20641718 is about 4543.3157495380. The cubic root of 20641718 is about 274.3144045768.

The spelling of 20641718 in words is "twenty million, six hundred forty-one thousand, seven hundred eighteen".