20668336 has 20 divisors (see below), whose sum is σ = 43125712. Its totient is φ = 9539136.

The previous prime is 20668331. The next prime is 20668343. The reversal of 20668336 is 63386602.

It is a super-2 number, since 2×20668336² = 854360226017792, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 49476 + ... + 49891.

Almost surely, 2^20668336 is an apocalyptic number.

20668336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20668336 is an abundant number, since it is smaller than the sum of its proper divisors (22457376).

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

20668336 is a wasteful number, since it uses less digits than its factorization.

20668336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99388 (or 99382 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 20668336 is about 4546.2441641425. The cubic root of 20668336 is about 274.4322656401.

The spelling of 20668336 in words is "twenty million, six hundred sixty-eight thousand, three hundred thirty-six".