20668337 has 8 divisors (see below), whose sum is σ = 21362880. Its totient is φ = 19983600.

The previous prime is 20668331. The next prime is 20668343. The reversal of 20668337 is 73386602.

It is an interprime number because it is at equal distance from previous prime (20668331) and next prime (20668343).

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 20668337 - 2⁶ = 20668273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20668297 and 20668306.

It is not an unprimeable number, because it can be changed into a prime (20668331) 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, 1964 + ... + 6722.

It is an arithmetic number, because the mean of its divisors is an integer number (2670360).

Almost surely, 2^20668337 is an apocalyptic number.

It is an amenable number.

20668337 is a deficient number, since it is larger than the sum of its proper divisors (694543).

20668337 is a wasteful number, since it uses less digits than its factorization.

20668337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4903.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20668337 is about 4546.2442741234. The cubic root of 20668337 is about 274.4322700660.

The spelling of 20668337 in words is "twenty million, six hundred sixty-eight thousand, three hundred thirty-seven".