20866337 has 2 divisors, whose sum is σ = 20866338. Its totient is φ = 20866336.

The previous prime is 20866319. The next prime is 20866343. The reversal of 20866337 is 73366802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14868736 + 5997601 = 3856^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20866337 - 2⁸ = 20866081 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20866297 and 20866306.

It is not a weakly prime, because it can be changed into another prime (20866357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433168 + 10433169.

It is an arithmetic number, because the mean of its divisors is an integer number (10433169).

Almost surely, 2^20866337 is an apocalyptic number.

It is an amenable number.

20866337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20866337 is an equidigital number, since it uses as much as digits as its factorization.

20866337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20866337 is about 4567.9685857063. The cubic root of 20866337 is about 275.3058283563.

The spelling of 20866337 in words is "twenty million, eight hundred sixty-six thousand, three hundred thirty-seven".