20659331 has 12 divisors (see below), whose sum is σ = 26217720. Its totient is φ = 16097760.

The previous prime is 20659321. The next prime is 20659337. The reversal of 20659331 is 13395602.

It is not a de Polignac number, because 20659331 - 2¹⁸ = 20397187 is a prime.

It is a super-2 number, since 2×20659331² = 853615914735122, 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 = 20659294 and 20659303.

It is not an unprimeable number, because it can be changed into a prime (20659337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18626 + ... + 19703.

It is an arithmetic number, because the mean of its divisors is an integer number (2184810).

Almost surely, 2^20659331 is an apocalyptic number.

20659331 is a deficient number, since it is larger than the sum of its proper divisors (5558389).

20659331 is a wasteful number, since it uses less digits than its factorization.

20659331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38354 (or 38347 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20659331 is about 4545.2536782890. The cubic root of 20659331 is about 274.3924039963.

The spelling of 20659331 in words is "twenty million, six hundred fifty-nine thousand, three hundred thirty-one".