20668039 has 32 divisors (see below), whose sum is σ = 26593920. Its totient is φ = 15654912.

The previous prime is 20668027. The next prime is 20668051. The reversal of 20668039 is 93086602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20668027) and next prime (20668051).

It is not a de Polignac number, because 20668039 - 2⁹ = 20667527 is a prime.

It is a super-2 number, since 2×20668039² = 854335672211042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20667995 and 20668013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182847 + ... + 182959.

It is an arithmetic number, because the mean of its divisors is an integer number (831060).

Almost surely, 2^20668039 is an apocalyptic number.

20668039 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20668039 is a deficient number, since it is larger than the sum of its proper divisors (5925881).

20668039 is a wasteful number, since it uses less digits than its factorization.

20668039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20668039 is about 4546.2114996995. The cubic root of 20668039 is about 274.4309511209.

The spelling of 20668039 in words is "twenty million, six hundred sixty-eight thousand, thirty-nine".