20668338 has 16 divisors (see below), whose sum is σ = 45929760. Its totient is φ = 6889428.

The previous prime is 20668331. The next prime is 20668343. The reversal of 20668338 is 83386602.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

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, 191320 + ... + 191427.

It is an arithmetic number, because the mean of its divisors is an integer number (2870610).

Almost surely, 2^20668338 is an apocalyptic number.

20668338 is an abundant number, since it is smaller than the sum of its proper divisors (25261422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20668338 is a wasteful number, since it uses less digits than its factorization.

20668338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382758 (or 382752 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20668338 is about 4546.2443841043. The cubic root of 20668338 is about 274.4322744920.

It can be divided in two parts, 2066 and 8338, that added together give a square (10404 = 102²).

The spelling of 20668338 in words is "twenty million, six hundred sixty-eight thousand, three hundred thirty-eight".