20866329 has 30 divisors (see below), whose sum is σ = 34278090. Its totient is φ = 12640320.

The previous prime is 20866319. The next prime is 20866337. The reversal of 20866329 is 92366802.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 5184729 = 3960^2 + 2277^2 .

It is not a de Polignac number, because 20866329 - 2⁷ = 20866201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20866293 and 20866302.

It is not an unprimeable number, because it can be changed into a prime (20866319) 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 29 ways as a sum of consecutive naturals, for example, 8737 + ... + 10865.

It is an arithmetic number, because the mean of its divisors is an integer number (1142603).

Almost surely, 2^20866329 is an apocalyptic number.

It is an amenable number.

20866329 is a deficient number, since it is larger than the sum of its proper divisors (13411761).

20866329 is a wasteful number, since it uses less digits than its factorization.

20866329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163 (or 2143 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20866329 is about 4567.9677100435. The cubic root of 20866329 is about 275.3057931729.

The spelling of 20866329 in words is "twenty million, eight hundred sixty-six thousand, three hundred twenty-nine".