20607817 has 2 divisors, whose sum is σ = 20607818. Its totient is φ = 20607816.

The previous prime is 20607781. The next prime is 20607833. The reversal of 20607817 is 71870602.

It is a happy number.

Together with previous prime (20607781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13366336 + 7241481 = 3656^2 + 2691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20607817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20607857) 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 as a sum of consecutive naturals, namely, 10303908 + 10303909.

It is an arithmetic number, because the mean of its divisors is an integer number (10303909).

Almost surely, 2^20607817 is an apocalyptic number.

It is an amenable number.

20607817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20607817 is an equidigital number, since it uses as much as digits as its factorization.

20607817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20607817 is about 4539.5833509255. The cubic root of 20607817 is about 274.1641485384.

The spelling of 20607817 in words is "twenty million, six hundred seven thousand, eight hundred seventeen".