20664101 has 8 divisors (see below), whose sum is σ = 21085440. Its totient is φ = 20245248.

The previous prime is 20664031. The next prime is 20664113. The reversal of 20664101 is 10146602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20664101 - 2¹⁸ = 20401957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33740 + ... + 34346.

It is an arithmetic number, because the mean of its divisors is an integer number (2635680).

Almost surely, 2^20664101 is an apocalyptic number.

It is an amenable number.

20664101 is a deficient number, since it is larger than the sum of its proper divisors (421339).

20664101 is an equidigital number, since it uses as much as digits as its factorization.

20664101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20664101 is about 4545.7783711923. The cubic root of 20664101 is about 274.4135203795.

The spelling of 20664101 in words is "twenty million, six hundred sixty-four thousand, one hundred one".