20865329 has 2 divisors, whose sum is σ = 20865330. Its totient is φ = 20865328.

The previous prime is 20865319. The next prime is 20865359. The reversal of 20865329 is 92356802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14615329 + 6250000 = 3823^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20865329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20865319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10432664 + 10432665.

It is an arithmetic number, because the mean of its divisors is an integer number (10432665).

Almost surely, 2^20865329 is an apocalyptic number.

It is an amenable number.

20865329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20865329 is an equidigital number, since it uses as much as digits as its factorization.

20865329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 20865329 is about 4567.8582508655. The cubic root of 20865329 is about 275.3013951753.

The spelling of 20865329 in words is "twenty million, eight hundred sixty-five thousand, three hundred twenty-nine".